Login In
2021 Volume 40 Issue 3
2021, 40(3): 277-282
doi: 10.14102/j.cnki.0254–5861.2011–2853
Abstract:
Two inorganic acids decorating titanium-oxo clusters (PTCs), Ti6O4(OiPr)10(O3P-Phen)2(NO3)2 (PTC-251) and Ti6O4(OiPr)10(O3P-Phen)2(HSO4)2 (PTC-252) (H2O3P-Phen = phenylphosphinic acid) have been synthesized under solvothermal conditions. As a result of the labile coordination sites of the {Ti6P2} unit, nitrite and sulfate adopt different capping mode. Besides, they also present different space packing. The photocatalytic H2 evolution activities of these obtained PTCs have been studied, with sulfate decorating PTC-252 presenting a maximum H2 production rate up to 110.95 μmol·g-1·h-1.
Two inorganic acids decorating titanium-oxo clusters (PTCs), Ti6O4(OiPr)10(O3P-Phen)2(NO3)2 (PTC-251) and Ti6O4(OiPr)10(O3P-Phen)2(HSO4)2 (PTC-252) (H2O3P-Phen = phenylphosphinic acid) have been synthesized under solvothermal conditions. As a result of the labile coordination sites of the {Ti6P2} unit, nitrite and sulfate adopt different capping mode. Besides, they also present different space packing. The photocatalytic H2 evolution activities of these obtained PTCs have been studied, with sulfate decorating PTC-252 presenting a maximum H2 production rate up to 110.95 μmol·g-1·h-1.
2021, 40(3): 283-290
doi: 10.14102/j.cnki.0254–5861.2011–2882
Abstract:
Fe2AlB2 powder material was prepared by the direct reaction of iron, aluminum and boron powders in a tubular furnace. The effects of different Al contents, temperature and raw material pretreatment on the purity of product were studied. The mixed powder with the stoichiometric ratio of 1.5Al/2Fe/2B was processed by CIP (Cold Isostatic Pressing), and then calcined at 1150 ℃ for 120 min. The product containing a small amount of impurities is treated with alkaline solution to obtain high-purity Fe2AlB2 powder. ZrB2-Fe2AlB2 composite ceramic was successfully prepared at 1250 ℃ by hot pressing sintering. The density, hardness and fracture toughness were 96.2%, 22 ± 0.3 GPa and 5.78 ± 0.5 MPa·m1/2, respectively.
Fe2AlB2 powder material was prepared by the direct reaction of iron, aluminum and boron powders in a tubular furnace. The effects of different Al contents, temperature and raw material pretreatment on the purity of product were studied. The mixed powder with the stoichiometric ratio of 1.5Al/2Fe/2B was processed by CIP (Cold Isostatic Pressing), and then calcined at 1150 ℃ for 120 min. The product containing a small amount of impurities is treated with alkaline solution to obtain high-purity Fe2AlB2 powder. ZrB2-Fe2AlB2 composite ceramic was successfully prepared at 1250 ℃ by hot pressing sintering. The density, hardness and fracture toughness were 96.2%, 22 ± 0.3 GPa and 5.78 ± 0.5 MPa·m1/2, respectively.
2021, 40(3): 291-300
doi: 10.14102/j.cnki.0254–5861.2011–2871
Abstract:
The present research paper presents the synthesis, characterization, biological and computational studies of 4-(benzylideneamino) benzoic acid derivatives (3a~3g). Derivatives 3a~3c displayed best antidiabetic potential with a glucose-lowering effect compared to the reference drug Glibenclamide. Biochemical parameters including plasma glucose, serum triglycerides, cholesterol, alanine amino transferase and aspartate amino transferase levels showed significant alterations in concentrations relative to the control. Similarly, the derivatives 3a, 3d and 3e displayed potent in vitro antibacterial potential. Molecular docking simulations delineated that the ligands and complexes were stabilized at the active site by electrostatic and hydrophobic forces, consistent with the corresponding experimental results. In silico study of the binding pattern predicted that the synthesized ligands, 3d and 3a could serve as a potential surrogate for hit-to-lead generation and the design of novel antibacterial drugs.
The present research paper presents the synthesis, characterization, biological and computational studies of 4-(benzylideneamino) benzoic acid derivatives (3a~3g). Derivatives 3a~3c displayed best antidiabetic potential with a glucose-lowering effect compared to the reference drug Glibenclamide. Biochemical parameters including plasma glucose, serum triglycerides, cholesterol, alanine amino transferase and aspartate amino transferase levels showed significant alterations in concentrations relative to the control. Similarly, the derivatives 3a, 3d and 3e displayed potent in vitro antibacterial potential. Molecular docking simulations delineated that the ligands and complexes were stabilized at the active site by electrostatic and hydrophobic forces, consistent with the corresponding experimental results. In silico study of the binding pattern predicted that the synthesized ligands, 3d and 3a could serve as a potential surrogate for hit-to-lead generation and the design of novel antibacterial drugs.
2021, 40(3): 301-305
doi: 10.14102/j.cnki.0254–5861.2011–2843
Abstract:
One novel discrete coordination molecule with AgI centers, namely [Ag3(L)3(ClO4)3]∙3CH2Cl2∙ 6CH3OH∙1.5H2O (1), has been synthesized based on the double Schiff-base ligand, 3, 6-bis[2-(4-oxidequinoxaline)-yl]-4, 5-diaza-3, 5-octadiene (L) and AgClO4. The obtained Ag(I) compound was fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. 1 is of trigonal system space group P-31c with a = 16.320(2), b = 16.320(2), c = 20.108(6) Å, T = 173(2) K, V = 4638.2(16) Å3, Dc = 1.645 g/cm3, Mr = 2297.33, Z = 2, F(000) = 2334, μ = 0.970 mm–1, Goodness-of-fit = 1.109, the final R = 0.0776, wR = 0.1813, R indices (all data) = 0.1196, wR = 0.2011. The compound exhibits a triple-helical [Ag3L3]3+ crown-like trimer, in which three Ag(I) atoms form an equilateral triangle with the Ag···Ag distance of 4.7 Å. Uncoordinated counterions ClO4– and solvent molecules methanol generate the hydrogen-bonded frameworks based on discrete molecular complex building blocks.
One novel discrete coordination molecule with AgI centers, namely [Ag3(L)3(ClO4)3]∙3CH2Cl2∙ 6CH3OH∙1.5H2O (1), has been synthesized based on the double Schiff-base ligand, 3, 6-bis[2-(4-oxidequinoxaline)-yl]-4, 5-diaza-3, 5-octadiene (L) and AgClO4. The obtained Ag(I) compound was fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. 1 is of trigonal system space group P-31c with a = 16.320(2), b = 16.320(2), c = 20.108(6) Å, T = 173(2) K, V = 4638.2(16) Å3, Dc = 1.645 g/cm3, Mr = 2297.33, Z = 2, F(000) = 2334, μ = 0.970 mm–1, Goodness-of-fit = 1.109, the final R = 0.0776, wR = 0.1813, R indices (all data) = 0.1196, wR = 0.2011. The compound exhibits a triple-helical [Ag3L3]3+ crown-like trimer, in which three Ag(I) atoms form an equilateral triangle with the Ag···Ag distance of 4.7 Å. Uncoordinated counterions ClO4– and solvent molecules methanol generate the hydrogen-bonded frameworks based on discrete molecular complex building blocks.
2021, 40(3): 306-310
doi: 10.14102/j.cnki.0254–5861.2011–2852
Abstract:
A coordination polymer formulated as [Mn(5-pncH2)2H2O] (1, 5-pncH3 = 5-phosphono-1-naphthalenecarboxylic acid), was hydrothermally synthesized and magnetically characterized. Compound 1 features a three-dimensional structure in which the inorganic chains of [Mn(O-P-O)]n are cross-linked by the organic groups of phosphonate ligands. Magnetic measurements of 1 indicate that dominant antiferromagnetic interactions are mediated between the MnII centers.
A coordination polymer formulated as [Mn(5-pncH2)2H2O] (1, 5-pncH3 = 5-phosphono-1-naphthalenecarboxylic acid), was hydrothermally synthesized and magnetically characterized. Compound 1 features a three-dimensional structure in which the inorganic chains of [Mn(O-P-O)]n are cross-linked by the organic groups of phosphonate ligands. Magnetic measurements of 1 indicate that dominant antiferromagnetic interactions are mediated between the MnII centers.
2021, 40(3): 311-316
doi: 10.14102/j.cnki.0254–5861.2011–2855
Abstract:
A new sulfonylcalixarene-based coordination container 1 was designed and synthesized from the self-assembly reaction of p-tert-butylsulfonylcalix[4]arene (TBSC), Co(II) ion, and 2, 6-naphthalenedicarboxylic acid (NDC). It crystallizes in tetragonal system, space group I4/m with a = b = 30.9119(19) Å, c = 43.565(3) Å, V = 41628(6) Å3, Dc = 0.731 g/cm3, Mr = 9162.36, C384H348Co24O126S24, Z = 2, F(000) = 9384, μ = 0.566 mm–1, the final GOOF = 1.027, R = 0.0987 and wR = 0.2474 for 7240 observed reflections with I > 2σ(I). Structural analyses indicate that 1 adopts an edge-directed octahedral geometry and consists of six TBSC-supported Co4 tetranuclear units locating on the vertices and twelve NDC bridging ligands occupying the edges. The new compound exhibits outstanding performance for the C2 hydrocarbons separation over CH4.
A new sulfonylcalixarene-based coordination container 1 was designed and synthesized from the self-assembly reaction of p-tert-butylsulfonylcalix[4]arene (TBSC), Co(II) ion, and 2, 6-naphthalenedicarboxylic acid (NDC). It crystallizes in tetragonal system, space group I4/m with a = b = 30.9119(19) Å, c = 43.565(3) Å, V = 41628(6) Å3, Dc = 0.731 g/cm3, Mr = 9162.36, C384H348Co24O126S24, Z = 2, F(000) = 9384, μ = 0.566 mm–1, the final GOOF = 1.027, R = 0.0987 and wR = 0.2474 for 7240 observed reflections with I > 2σ(I). Structural analyses indicate that 1 adopts an edge-directed octahedral geometry and consists of six TBSC-supported Co4 tetranuclear units locating on the vertices and twelve NDC bridging ligands occupying the edges. The new compound exhibits outstanding performance for the C2 hydrocarbons separation over CH4.
2021, 40(3): 317-323
doi: 10.14102/j.cnki.0254–5861.2011–2857
Abstract:
A Fe-based coordination polymer, [Fe(C2O4)0.5(4-NCP)]n·2nH2O (1, 4-HNCP = 2-(4-carboxy- phenyl)-1H-imidazo(4, 5-f)-(1, 10)phenanthroline, H2C2O4 = oxalic acid), was hydrothermally synthesized and characterized by infrared spectrum, elemental analysis, single-crystal X-ray diffraction, power X-ray diffraction, and UV-vis absorption spectrum. Structural analyses reveal that polymer 1 possesses a (4, 4)-connected 2D network. In addition, 1 shows photocatalytic activity toward the degradation of rhodamine B (RhB) in the presence of H2O2 under visible light illumination.
A Fe-based coordination polymer, [Fe(C2O4)0.5(4-NCP)]n·2nH2O (1, 4-HNCP = 2-(4-carboxy- phenyl)-1H-imidazo(4, 5-f)-(1, 10)phenanthroline, H2C2O4 = oxalic acid), was hydrothermally synthesized and characterized by infrared spectrum, elemental analysis, single-crystal X-ray diffraction, power X-ray diffraction, and UV-vis absorption spectrum. Structural analyses reveal that polymer 1 possesses a (4, 4)-connected 2D network. In addition, 1 shows photocatalytic activity toward the degradation of rhodamine B (RhB) in the presence of H2O2 under visible light illumination.
2021, 40(3): 324-328
doi: 10.14102/j.cnki.0254–5861.2011–2860
Abstract:
A novel Ca(II) coordination polymer, [CaL2(H2O)2]n (1, HL = 4-acetylphenoxyacetic acid) has been synthesized with 4-acetylphenoxyacetic acid, Ca(ClO4)2·4H2O and NaOH as raw materials. Complex 1 was characterized by elemental analysis and single-crystal X-ray diffraction analysis. The results show that the Ca(II) ion is eight-coordinated in a distorted triangular dodecahedral geometric configuration with six carboxylate O atoms of four L ligands and two O atoms of two coordinated water molecules. Complex 1 forms a one-dimensional chained structure by the bridging effect of carboxylate O atoms. The antitumor activity of HL ligand and complex 1 has also been investigated.
A novel Ca(II) coordination polymer, [CaL2(H2O)2]n (1, HL = 4-acetylphenoxyacetic acid) has been synthesized with 4-acetylphenoxyacetic acid, Ca(ClO4)2·4H2O and NaOH as raw materials. Complex 1 was characterized by elemental analysis and single-crystal X-ray diffraction analysis. The results show that the Ca(II) ion is eight-coordinated in a distorted triangular dodecahedral geometric configuration with six carboxylate O atoms of four L ligands and two O atoms of two coordinated water molecules. Complex 1 forms a one-dimensional chained structure by the bridging effect of carboxylate O atoms. The antitumor activity of HL ligand and complex 1 has also been investigated.
2021, 40(3): 329-335
doi: 10.14102/j.cnki.0254–5861.2011–2864
Abstract:
A new metal-organic coordination complex [Cd(imp)(m-bdc)]n (1, ipm = 5-(1H-imidazo[4, 5-f][1, 10] phenanthrolin-2-yl)-2-methoxyphenol, m-bdc = isophthalic acid) has been synthesized by hydrothermal reaction and characterized by elemental analysis, thermogravimetric (TG) analysis, infrared spectrum (IR) and single-crystal X-ray diffraction. Complex 1 crystallizes in monoclinic, space group C2/c with a = 15.373(5), b = 16.719(5), c = 19.406(6) Å, β = 106.995(5)°, V = 4770(2) Å3, C28H18CdN4O6, Mr = 618.86, Dc = 1.724 g/cm3, μ(MoKα) = 0.971 mm–1, F(000) = 2480, Z = 8, the final R = 0.0391 and wR = 0.1044 for 4701 observed reflections (I > 2σ(I)). Single-crystal X-ray diffraction reveals that 1 exhibits a one-dimensional (1D) double-chain architecture, and the H-bond intersections link the 1D double-chain architecture into a 2D layer structure. TG analysis shows clear courses of weight loss, which corresponds to the decomposition of different ligands. We also study the luminescent properties of complex 1. In addition, to elucidate the essential electronic characters of this complex, theoretical calculation analysis was performed by the PBE0/LANL2DZ method in Gaussian 03 Program.
A new metal-organic coordination complex [Cd(imp)(m-bdc)]n (1, ipm = 5-(1H-imidazo[4, 5-f][1, 10] phenanthrolin-2-yl)-2-methoxyphenol, m-bdc = isophthalic acid) has been synthesized by hydrothermal reaction and characterized by elemental analysis, thermogravimetric (TG) analysis, infrared spectrum (IR) and single-crystal X-ray diffraction. Complex 1 crystallizes in monoclinic, space group C2/c with a = 15.373(5), b = 16.719(5), c = 19.406(6) Å, β = 106.995(5)°, V = 4770(2) Å3, C28H18CdN4O6, Mr = 618.86, Dc = 1.724 g/cm3, μ(MoKα) = 0.971 mm–1, F(000) = 2480, Z = 8, the final R = 0.0391 and wR = 0.1044 for 4701 observed reflections (I > 2σ(I)). Single-crystal X-ray diffraction reveals that 1 exhibits a one-dimensional (1D) double-chain architecture, and the H-bond intersections link the 1D double-chain architecture into a 2D layer structure. TG analysis shows clear courses of weight loss, which corresponds to the decomposition of different ligands. We also study the luminescent properties of complex 1. In addition, to elucidate the essential electronic characters of this complex, theoretical calculation analysis was performed by the PBE0/LANL2DZ method in Gaussian 03 Program.
2021, 40(3): 336-342
doi: 10.14102/j.cnki.0254–5861.2011–2901
Abstract:
Two new coordination complexes [Mn(L)2(DNSA)] (1) and [Co(L)(1, 4-bdc)]n (2) have been achieved under hydrothermal conditions (H2DNSA = 3, 5-dinitro-salicylic acid, 1, 4-bdc = 1, 4-benzenedicarboxylic acid and L = 2-(2-fluoro-6-fluorophenyl)-1H-imidazo[4, 5-f][1, 10]phenanthroline). 1 crystallizes in monoclinic, space group P21/c with a = 15.871(3), b = 17.274(4), c = 16.078(3) Å, β = 113.03(3)o, V = 4056.6(16) Å3, Z = 4, C45H22Cl2F2MnN10O7, Mr = 978.57, Dc = 1.602 g/cm3, F(000) = 1980, μ(MoKa) = 0.536 mm–1, R = 0.0437 and wR = 0.1065. 2 belongs to the monoclinic system, space group C2/c with a = 14.665(2), b = 30.856(4), c = 11.237(2) Å, β = 111.166(2)o, V = 4742.0(12) Å3, Z = 8, C27H14ClCoFN4O4, Mr = 517.80, Dc = 1.602 g/cm3, F(000) = 2312, μ(MoKa) = 0.889 mm–1, R = 0.0364 and wR = 0.0862. The central Mn(II) ion in 1 is six-coordinated by four nitrogen atoms from two L ligands and two oxygen atoms from one DNSA anion. In 2, the two kinds of 1, 4-bdc ligands link neighboring Co(II) atoms to yield a two-dimensional layer structure. The luminescence of 1 has been studied in detail. Moreover, thermal behaviors of 1 and 2 are also investigated.
Two new coordination complexes [Mn(L)2(DNSA)] (1) and [Co(L)(1, 4-bdc)]n (2) have been achieved under hydrothermal conditions (H2DNSA = 3, 5-dinitro-salicylic acid, 1, 4-bdc = 1, 4-benzenedicarboxylic acid and L = 2-(2-fluoro-6-fluorophenyl)-1H-imidazo[4, 5-f][1, 10]phenanthroline). 1 crystallizes in monoclinic, space group P21/c with a = 15.871(3), b = 17.274(4), c = 16.078(3) Å, β = 113.03(3)o, V = 4056.6(16) Å3, Z = 4, C45H22Cl2F2MnN10O7, Mr = 978.57, Dc = 1.602 g/cm3, F(000) = 1980, μ(MoKa) = 0.536 mm–1, R = 0.0437 and wR = 0.1065. 2 belongs to the monoclinic system, space group C2/c with a = 14.665(2), b = 30.856(4), c = 11.237(2) Å, β = 111.166(2)o, V = 4742.0(12) Å3, Z = 8, C27H14ClCoFN4O4, Mr = 517.80, Dc = 1.602 g/cm3, F(000) = 2312, μ(MoKa) = 0.889 mm–1, R = 0.0364 and wR = 0.0862. The central Mn(II) ion in 1 is six-coordinated by four nitrogen atoms from two L ligands and two oxygen atoms from one DNSA anion. In 2, the two kinds of 1, 4-bdc ligands link neighboring Co(II) atoms to yield a two-dimensional layer structure. The luminescence of 1 has been studied in detail. Moreover, thermal behaviors of 1 and 2 are also investigated.
2021, 40(3): 343-348
doi: 10.14102/j.cnki.0254–5861.2011–2877
Abstract:
A novel coordination polymer 1 with formula of Zn2(BDC)2(TPPA) was built from 1, 4-dicarboxybenzene (H2BDC), tris(4-(pyridin-3-yl)phenyl)amine (TPPA), and Zn(II) ion. It was characterized by single-crystal and powder X-ray diffraction, Fourier-transform infrared spectra (FT-IR), thermal gravimetric analysis (TGA), and UV-vis. 1 crystallizes in triclinic space group P\begin{document}$ \overline 1 $\end{document}
A novel coordination polymer 1 with formula of Zn2(BDC)2(TPPA) was built from 1, 4-dicarboxybenzene (H2BDC), tris(4-(pyridin-3-yl)phenyl)amine (TPPA), and Zn(II) ion. It was characterized by single-crystal and powder X-ray diffraction, Fourier-transform infrared spectra (FT-IR), thermal gravimetric analysis (TGA), and UV-vis. 1 crystallizes in triclinic space group P
2021, 40(3): 349-356
doi: 10.14102/j.cnki.0254–5861.2011–2923
Abstract:
Two new complexes [Cu(AQTC)0.5(H2O)3]·3H2O}n (1, H4AQTC = anthraquinone-1, 4, 5, 8-tetracarboxylic acid) and Cu[(Py)2C(OH)2]2(H2AQTC)·2H2O (2, (Py)2CO = di-2-pyridyl ketone) have been prepared and characterized by elemental analyses and IR spectroscopy. X-ray crystallographic studies show that complex 1 crystallizes in monoclinic space group C2/m and complex 2 in monoclinic space group P21/c. Complex 1 features a 1D chain structure by carboxyl oxygen atoms. Complex 2 displays a mononuclear structure and anions and cations are separated. What's interesting is that the ligand of H4AQTC with eight carboxyl oxygen atoms and two quinone oxygen atoms does not directly coordinate with metals, and only exist as a counter-anion in complex 2. Three-dimensional structures of two complexes are formed by intermolecular interactions. The thermogravimetric analyses of two complexes are investigated. The luminescent properties of complex 1 are investigated as well.
Two new complexes [Cu(AQTC)0.5(H2O)3]·3H2O}n (1, H4AQTC = anthraquinone-1, 4, 5, 8-tetracarboxylic acid) and Cu[(Py)2C(OH)2]2(H2AQTC)·2H2O (2, (Py)2CO = di-2-pyridyl ketone) have been prepared and characterized by elemental analyses and IR spectroscopy. X-ray crystallographic studies show that complex 1 crystallizes in monoclinic space group C2/m and complex 2 in monoclinic space group P21/c. Complex 1 features a 1D chain structure by carboxyl oxygen atoms. Complex 2 displays a mononuclear structure and anions and cations are separated. What's interesting is that the ligand of H4AQTC with eight carboxyl oxygen atoms and two quinone oxygen atoms does not directly coordinate with metals, and only exist as a counter-anion in complex 2. Three-dimensional structures of two complexes are formed by intermolecular interactions. The thermogravimetric analyses of two complexes are investigated. The luminescent properties of complex 1 are investigated as well.
2021, 40(3): 357-362
doi: 10.14102/j.cnki.0254–5861.2011–2921
Abstract:
A Ti6-core-based titanium oxo cluster (TOC) [Ti6(μ2-O)2(μ3-O)2(Bpo)2(PhCOO)8(OiPr)4] assembled by 2, 2΄-biphenol (H2Bpo) and benzoic acid has been synthesized and characterized by IR, elemental analyses, thermogravimetric analysis and X-ray diffraction technique. Single-crystal X-ray diffraction analysis revealed that the complex crystallizes in monoclinic system, space group P21/n. The structure contains two Ti3(μ3-O) units featuring a flat mode as building blocks. Solid-state UV/Vis absorption spectrum reveals that complex 1 shows a wide range from 240 to 650 nm. Moreover, the optical band gap of 1 is estimated to be 2.35 eV. Additionally, the Ti6-TOC exhibits good photocurrent response.
A Ti6-core-based titanium oxo cluster (TOC) [Ti6(μ2-O)2(μ3-O)2(Bpo)2(PhCOO)8(OiPr)4] assembled by 2, 2΄-biphenol (H2Bpo) and benzoic acid has been synthesized and characterized by IR, elemental analyses, thermogravimetric analysis and X-ray diffraction technique. Single-crystal X-ray diffraction analysis revealed that the complex crystallizes in monoclinic system, space group P21/n. The structure contains two Ti3(μ3-O) units featuring a flat mode as building blocks. Solid-state UV/Vis absorption spectrum reveals that complex 1 shows a wide range from 240 to 650 nm. Moreover, the optical band gap of 1 is estimated to be 2.35 eV. Additionally, the Ti6-TOC exhibits good photocurrent response.
2021, 40(3): 363-368
doi: 10.14102/j.cnki.0254–5861.2011–2931
Abstract:
A new binuclear nickel(II) complex Ni2(HPT)4(H2O)3 (1) has been hydrothermally synthesized with nickel hydroxide, 3, 4-pyridine dicarboxylic acid and 3-(pyridin-2-yl)-1, 2, 4-triazole (HPT) in the mixed solution (the volume ratio of methanol and water is 1:4). It crystallizes in tetragonal space group P42/n, with a = 20.844(1), b = 20.844(1), c = 7.2463(7) Å, V = 3148.2(5) Å3, Dc = 1.587 g/cm3, Z = 4, μ(MoKa) = 1.257, F(000) = 1544, the final GOOF = 1.043, R = 0.0437 and wR = 0.1297. The crystal structure shows that the whole molecule consists of two nickel ions which are bridged by four μ2-η1: η0-3-(pyridin-2-yl)-1, 2, 4-triazole anions. The coordination environment of Ni(II) ion is NiN6, giving a distorted octahedral geometry. The thermal stability and fluorescent and magnetic properties of the complex were investigated.
A new binuclear nickel(II) complex Ni2(HPT)4(H2O)3 (1) has been hydrothermally synthesized with nickel hydroxide, 3, 4-pyridine dicarboxylic acid and 3-(pyridin-2-yl)-1, 2, 4-triazole (HPT) in the mixed solution (the volume ratio of methanol and water is 1:4). It crystallizes in tetragonal space group P42/n, with a = 20.844(1), b = 20.844(1), c = 7.2463(7) Å, V = 3148.2(5) Å3, Dc = 1.587 g/cm3, Z = 4, μ(MoKa) = 1.257, F(000) = 1544, the final GOOF = 1.043, R = 0.0437 and wR = 0.1297. The crystal structure shows that the whole molecule consists of two nickel ions which are bridged by four μ2-η1: η0-3-(pyridin-2-yl)-1, 2, 4-triazole anions. The coordination environment of Ni(II) ion is NiN6, giving a distorted octahedral geometry. The thermal stability and fluorescent and magnetic properties of the complex were investigated.
2021, 40(3): 369-375
doi: 10.14102/j.cnki.0254–5861.2011–2917
Abstract:
A new water-stable europium MOF, (Me2NH2)[Eu(abtc)(phen)]·2H2O (1), has been synthesized from Eu(NO3)3·6H2O with 1, 10-phenanthroline (phen) and 3, 3′, 5, 5′-azobenzenetetracarboxylic acid (H4abtc) ligands under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis, IR, TGA and PXRD. It crystallizes in monoclinic system, C2/c space group, with a = 16.278(3), b = 14.261(3), c = 27.936(5) Å, β = 103.464(3)°, V = 6307(2) Å3, Z = 8, C30H26EuN5O10, Mr = 768.5, Dc = 1.543 g/cm3, F(000) = 2912, μ(MoKa) = 2.044 mm‒1, R = 0.0315 and wR = 0.0663. In the structure of 1, the EuO7N2 polyhedra are assembled into a 2D layer with rhombic windows and these layers are further condensed to form a 3D framework. It can be used as selective and sensitive fluorescence sensors capable of detecting diethyl ether vapor.
A new water-stable europium MOF, (Me2NH2)[Eu(abtc)(phen)]·2H2O (1), has been synthesized from Eu(NO3)3·6H2O with 1, 10-phenanthroline (phen) and 3, 3′, 5, 5′-azobenzenetetracarboxylic acid (H4abtc) ligands under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis, IR, TGA and PXRD. It crystallizes in monoclinic system, C2/c space group, with a = 16.278(3), b = 14.261(3), c = 27.936(5) Å, β = 103.464(3)°, V = 6307(2) Å3, Z = 8, C30H26EuN5O10, Mr = 768.5, Dc = 1.543 g/cm3, F(000) = 2912, μ(MoKa) = 2.044 mm‒1, R = 0.0315 and wR = 0.0663. In the structure of 1, the EuO7N2 polyhedra are assembled into a 2D layer with rhombic windows and these layers are further condensed to form a 3D framework. It can be used as selective and sensitive fluorescence sensors capable of detecting diethyl ether vapor.
2021, 40(3): 376-382
doi: 10.14102/j.cnki.0254–5861.2011–2903
Abstract:
Electroreduction of CO2 to formic acid has attracted extensive attention, because it is a promising strategy to re-utilize CO2 and reduce greenhouse gas emissions that may favor the mitigation of energy and environment issues. Although great efforts have been made to tune the structure and composition of catalysts aiming to improve CO2 conversion efficiency, seldom studies have been focused on the support regulation. In this work, ordered, porous TiO2 nanotube arrays have been used as model support to study the impact of pore structure for CO2 electrochemical reduction. It has been revealed that Pd supported on TiO2 nanotube arrays substrate exhibits enhanced performance towards CO2 reduction, showing a higher formate Faradaic efficiency of 20% over than Pd supported on TiO2 film substrate. This study will shed new light on the design and synthesis of efficient catalysts by tuning the morphology of support for CO2 conversion.
Electroreduction of CO2 to formic acid has attracted extensive attention, because it is a promising strategy to re-utilize CO2 and reduce greenhouse gas emissions that may favor the mitigation of energy and environment issues. Although great efforts have been made to tune the structure and composition of catalysts aiming to improve CO2 conversion efficiency, seldom studies have been focused on the support regulation. In this work, ordered, porous TiO2 nanotube arrays have been used as model support to study the impact of pore structure for CO2 electrochemical reduction. It has been revealed that Pd supported on TiO2 nanotube arrays substrate exhibits enhanced performance towards CO2 reduction, showing a higher formate Faradaic efficiency of 20% over than Pd supported on TiO2 film substrate. This study will shed new light on the design and synthesis of efficient catalysts by tuning the morphology of support for CO2 conversion.
2021, 40(3): 383-393
doi: 10.14102/j.cnki.0254–5861.2011–2878
Abstract:
Polymeric membranes with diverse structures have attracted much attention as new materials for nonlinear optical devices. In this report, a novel oligomer of poly (aromatic ether sulfone) (OAES) has been synthesized and characterized. The electronic structure as well as linear and nonlinear optical properties has been studied by density function theory. The effect for general nonlinear optical polarizability of various condition has been further researched such as absence of side chains and introduction of phenyl substituent on side chains. The static and frequency-dependent hyperpolarizabilities of OAES and its derivatives have been calculated. This work interprets an efficient adjustment for the frequency response and the intensity of nonlinear optical polarizability can be achieved by regulating the structure of system, which provides a new potential for the application of oligomeric materials on nonlinear optical field.
Polymeric membranes with diverse structures have attracted much attention as new materials for nonlinear optical devices. In this report, a novel oligomer of poly (aromatic ether sulfone) (OAES) has been synthesized and characterized. The electronic structure as well as linear and nonlinear optical properties has been studied by density function theory. The effect for general nonlinear optical polarizability of various condition has been further researched such as absence of side chains and introduction of phenyl substituent on side chains. The static and frequency-dependent hyperpolarizabilities of OAES and its derivatives have been calculated. This work interprets an efficient adjustment for the frequency response and the intensity of nonlinear optical polarizability can be achieved by regulating the structure of system, which provides a new potential for the application of oligomeric materials on nonlinear optical field.
2021, 40(3): 394-402
doi: 10.14102/j.cnki.0254–5861.2011–3105
Abstract:
p-block metal composite oxides Sr1.36Sb2O6 and Sr2Sb2O7 synthesized by a hydrothermal method as photocatalysts in the degradation of tetracycline hydrochloride under UV light irradiation have been extensively studied. The effects of synthesis conditions on the photocatalytic activity were discussed. The Sr1.36Sb2O6-100 ℃-24 h-5 and Sr2Sb2O7-150℃-24 h-2 samples prepared under optimal conditions exhibited remarkably different photocatalytic activities. The essential factors influencing the difference of photocatalytic performance were revealed. The results showed that the different photocatalytic activities observed for Sr1.36Sb2O6 and Sr2Sb2O7 could be attributed to their different electronic and crystal structures. Our work will provide a new perspective for the screening and design of p-block metal composite oxide photocatalysts to enhance the removal of organic pollutants in the environment.
p-block metal composite oxides Sr1.36Sb2O6 and Sr2Sb2O7 synthesized by a hydrothermal method as photocatalysts in the degradation of tetracycline hydrochloride under UV light irradiation have been extensively studied. The effects of synthesis conditions on the photocatalytic activity were discussed. The Sr1.36Sb2O6-100 ℃-24 h-5 and Sr2Sb2O7-150℃-24 h-2 samples prepared under optimal conditions exhibited remarkably different photocatalytic activities. The essential factors influencing the difference of photocatalytic performance were revealed. The results showed that the different photocatalytic activities observed for Sr1.36Sb2O6 and Sr2Sb2O7 could be attributed to their different electronic and crystal structures. Our work will provide a new perspective for the screening and design of p-block metal composite oxide photocatalysts to enhance the removal of organic pollutants in the environment.
