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2020 Volume 37 Issue 4
2020, 37(4): 367-379
doi: 10.11944/j.issn.1000-0518.2020.04.190297
Abstract:
Owing to fascinating properties including high photon absorption coefficient, low exciton binding energy and high carrier mobility, as well as unique merits including excellent defect tolerance, enabling solution growth at low temperature, and feasibility in band gap tailoring, halide perovskites have attracted significant attention and emerged as one of hot topics in the area of optoelectronics. Exploring perovskite micro/nano-arrays on the basis of existing single micro/nano-wire device would undoubtedly promote their applications in the high-performance integrated (flexible) optoelectronics devices. Unfortunately, poor resistance of halide perovskite to general chemical agents (including water) hinders their integration by traditional photolithography process. Therefore, novel lithographic methodologies are highly required. This review briefly outlines the state-of-the-art progress on the synthesis of halide perovskite micro/nano-arrays, analyzes their merits, and depicts the recent progress of micro/nano-arrays in the area of optoelectronic devices. Finally, the challenges in the current stage and the development prospects in future are discussed to provide useful guidance in exploring novel perovskite based integrated devices in future.
Owing to fascinating properties including high photon absorption coefficient, low exciton binding energy and high carrier mobility, as well as unique merits including excellent defect tolerance, enabling solution growth at low temperature, and feasibility in band gap tailoring, halide perovskites have attracted significant attention and emerged as one of hot topics in the area of optoelectronics. Exploring perovskite micro/nano-arrays on the basis of existing single micro/nano-wire device would undoubtedly promote their applications in the high-performance integrated (flexible) optoelectronics devices. Unfortunately, poor resistance of halide perovskite to general chemical agents (including water) hinders their integration by traditional photolithography process. Therefore, novel lithographic methodologies are highly required. This review briefly outlines the state-of-the-art progress on the synthesis of halide perovskite micro/nano-arrays, analyzes their merits, and depicts the recent progress of micro/nano-arrays in the area of optoelectronic devices. Finally, the challenges in the current stage and the development prospects in future are discussed to provide useful guidance in exploring novel perovskite based integrated devices in future.
2020, 37(4): 380-386
doi: 10.11944/j.issn.1000-0518.2020.04.200005
Abstract:
Lithium iron phosphate (LiFePO4) electrode material has the advantages of high specific capacity, stable operating voltage, low cost and environmental friendliness. It is regarded as an ideal cathode material for lithium ion batteries and is one of the main cathode materials for electric vehicles. However, the performance of LiFePO4 batteries decreases significantly at low temperatures, limiting their use in winter and cold regions. The researchers analyzed the reasons and proposed some solutions. This mini-review summaries four methods for performance improve of LiFePO4 battery at low temperature: 1)pulse current; 2)electrolyte additives; 3)surface coating; and 4)bulk doping of LiFePO4.
Lithium iron phosphate (LiFePO4) electrode material has the advantages of high specific capacity, stable operating voltage, low cost and environmental friendliness. It is regarded as an ideal cathode material for lithium ion batteries and is one of the main cathode materials for electric vehicles. However, the performance of LiFePO4 batteries decreases significantly at low temperatures, limiting their use in winter and cold regions. The researchers analyzed the reasons and proposed some solutions. This mini-review summaries four methods for performance improve of LiFePO4 battery at low temperature: 1)pulse current; 2)electrolyte additives; 3)surface coating; and 4)bulk doping of LiFePO4.
2020, 37(4): 387-404
doi: 10.11944/j.issn.1000-0518.2020.04.190243
Abstract:
Lithium-sulfur batteries are considered to be the next-generation secondary batteries with development potentials due to high theoretical specific capacity and low cost. However, there are several limitations of the sulfur cathodes due to the insulating nature of sulfur and Li2S, the "shuttle effect" caused by the intermediate lithium polysulfides(Li2Sx, 4≤x≤8) dissolved and migrated in the electrolyte and serious side effects, resulting in low utilization of the active materials, poor cycling stability and rate performances. In this paper, the research progress of transition metal nano materials in lithium-sulfur batteries is reviewed. Especially, the synthetic methods of materials and the reaction mechanism for inhibiting the dissolution of lithium polysulfide and promoting the conversion are introduced and the development of cathode carrier materials for lithium-sulfur batteries is forecasted.
Lithium-sulfur batteries are considered to be the next-generation secondary batteries with development potentials due to high theoretical specific capacity and low cost. However, there are several limitations of the sulfur cathodes due to the insulating nature of sulfur and Li2S, the "shuttle effect" caused by the intermediate lithium polysulfides(Li2Sx, 4≤x≤8) dissolved and migrated in the electrolyte and serious side effects, resulting in low utilization of the active materials, poor cycling stability and rate performances. In this paper, the research progress of transition metal nano materials in lithium-sulfur batteries is reviewed. Especially, the synthetic methods of materials and the reaction mechanism for inhibiting the dissolution of lithium polysulfide and promoting the conversion are introduced and the development of cathode carrier materials for lithium-sulfur batteries is forecasted.
2020, 37(4): 405-415
doi: 10.11944/j.issn.1000-0518.2020.04.190230
Abstract:
Environment protection and environment-friendly energy development are very important for human and society. Proton exchange membrane fuel cell (PEMFCs) have attracted much interest due to their high energy conversion rate and pollution-free in recent years. The electrospun nanofibers show the specific properties, such as a high specific surface area, high porosity and fully interconnected three-dimensional network structure, and are one of feasible candidates for PEMFCs applications. The composite proton exchange membrane containing aligned nanofibers has the ability to achieve high proton conductivity, low fuel permeability in fuel cell and good chemical, thermal, and mechanical stabilities. In this paper, PEMFCs are introduced firstly, then, starting from the composite proton exchange membranes of different ionic polymer matrix, the application and mechanism of electrospun nanofibers in different kinds of ionic polymers such as Nafion, sulfonated polyimide (SPI), polybenzimidazole (PBI) and sulfonated polyether ether ketone (SPEEK) are introduced in details, and the main problems and the development trend are also discussed.
Environment protection and environment-friendly energy development are very important for human and society. Proton exchange membrane fuel cell (PEMFCs) have attracted much interest due to their high energy conversion rate and pollution-free in recent years. The electrospun nanofibers show the specific properties, such as a high specific surface area, high porosity and fully interconnected three-dimensional network structure, and are one of feasible candidates for PEMFCs applications. The composite proton exchange membrane containing aligned nanofibers has the ability to achieve high proton conductivity, low fuel permeability in fuel cell and good chemical, thermal, and mechanical stabilities. In this paper, PEMFCs are introduced firstly, then, starting from the composite proton exchange membranes of different ionic polymer matrix, the application and mechanism of electrospun nanofibers in different kinds of ionic polymers such as Nafion, sulfonated polyimide (SPI), polybenzimidazole (PBI) and sulfonated polyether ether ketone (SPEEK) are introduced in details, and the main problems and the development trend are also discussed.
2020, 37(4): 416-423
doi: 10.11944/j.issn.1000-0518.2020.04.190263
Abstract:
Rice is one of the most important food crops in China, but weeds therein have serious adverse effects on rice yield and quality. The use of chemical herbicides is the most effective way to control weeds in rice field. Two series of novel sulfonylurea compounds, 2, 5-substituted and 2, 6-substituted benzenes, were designed and synthesized with their structures characterized by nuclear magnetic resonance spectroscopy (NMR) and high-resolution mass spectrometry (HRMS). The herbicidal activity and crop safety tests of rice field showed that most of the new molecules showed good herbicidal activity in rice field, especially compound 10a has shown better herbicidal activity (the visual control effect of preliminary screening is more than 90%) toward the main weeds Echinochloa crusgalli and Eclipta prostratethan than that of ethersulfuron-methyl and chlorsulfuron as controls. The herbicidal crop safety of compound 10a is comparable to that of the controls.
Rice is one of the most important food crops in China, but weeds therein have serious adverse effects on rice yield and quality. The use of chemical herbicides is the most effective way to control weeds in rice field. Two series of novel sulfonylurea compounds, 2, 5-substituted and 2, 6-substituted benzenes, were designed and synthesized with their structures characterized by nuclear magnetic resonance spectroscopy (NMR) and high-resolution mass spectrometry (HRMS). The herbicidal activity and crop safety tests of rice field showed that most of the new molecules showed good herbicidal activity in rice field, especially compound 10a has shown better herbicidal activity (the visual control effect of preliminary screening is more than 90%) toward the main weeds Echinochloa crusgalli and Eclipta prostratethan than that of ethersulfuron-methyl and chlorsulfuron as controls. The herbicidal crop safety of compound 10a is comparable to that of the controls.
2020, 37(4): 424-432
doi: 10.11944/j.issn.1000-0518.2020.04.190140
Abstract:
Visible light-induced reaction of 1, 7-enyne with perfluoroalkyl halide through a tandem atom transfer radical addition (ATRA)/cyclization sequence, synthesizing fluorinated 2, 4-dihydroisoquinoline-2(1H)-one was developed. With polyfluoroalkyl iodine or bromine as the free radical precursor, fac-Ir (ppy)3 (molar fraction 1%) as the photosensitizer, ATRA/cyclization reactions of various benzene-linked 1, 7-enyne occurred successfully under 5 W blue light emitting diode (LED) irradiation. A series of polyfluorinated isoquinolone derivatives was synthesized in modorate to excellent yields (62%~84%). This highly efficient synthetic method is mild and clean, providing a new way for the synthesis of polyfluoride 2, 4-dihydroisoquinoline-2(1H)-ketone with potential medicinal value.
Visible light-induced reaction of 1, 7-enyne with perfluoroalkyl halide through a tandem atom transfer radical addition (ATRA)/cyclization sequence, synthesizing fluorinated 2, 4-dihydroisoquinoline-2(1H)-one was developed. With polyfluoroalkyl iodine or bromine as the free radical precursor, fac-Ir (ppy)3 (molar fraction 1%) as the photosensitizer, ATRA/cyclization reactions of various benzene-linked 1, 7-enyne occurred successfully under 5 W blue light emitting diode (LED) irradiation. A series of polyfluorinated isoquinolone derivatives was synthesized in modorate to excellent yields (62%~84%). This highly efficient synthetic method is mild and clean, providing a new way for the synthesis of polyfluoride 2, 4-dihydroisoquinoline-2(1H)-ketone with potential medicinal value.
2020, 37(4): 433-439
doi: 10.11944/j.issn.1000-0518.2020.04.190251
Abstract:
The effect of batch addition of the catalyst (copper powder) on the reaction rate during the synthesis of 4, 4'-diamino-1, 1'-dianthraquinone-3, 3'-disulfonic acid (DAS) was investigated systematically. The results indicate that 55 ℃ is the preferred reaction temperature. Copper powder and sodium bromate with a mass ratio of of 2:5 are first added, and the second portion of catalyst with a mass ratio of 1:5 copper powder to sodium bromate is then added during the reaction. The reaction time could be saved for 2~3 h compared to adding copper powder at one time (the mass ratio of copper powder to sodium bromate is 3:5). The copper salt mixed in DAS could be removed efficiently by addition of citric acid during the preparation process, which can improve the purity of DAS. When the mass ratio of copper powder to citric acid is 6:1, the content of copper salt in DAS is less than 0.001%. In addition, the influence of the residual amount of the filtrate after distillation on the yield of DAS is also explored and the yield of DAS is above 95% when the remaining amount of filtrate is 20 mL. The results of this study also indicate that to further improve the yield of the reaction, more efficient catalyst is needed.
The effect of batch addition of the catalyst (copper powder) on the reaction rate during the synthesis of 4, 4'-diamino-1, 1'-dianthraquinone-3, 3'-disulfonic acid (DAS) was investigated systematically. The results indicate that 55 ℃ is the preferred reaction temperature. Copper powder and sodium bromate with a mass ratio of of 2:5 are first added, and the second portion of catalyst with a mass ratio of 1:5 copper powder to sodium bromate is then added during the reaction. The reaction time could be saved for 2~3 h compared to adding copper powder at one time (the mass ratio of copper powder to sodium bromate is 3:5). The copper salt mixed in DAS could be removed efficiently by addition of citric acid during the preparation process, which can improve the purity of DAS. When the mass ratio of copper powder to citric acid is 6:1, the content of copper salt in DAS is less than 0.001%. In addition, the influence of the residual amount of the filtrate after distillation on the yield of DAS is also explored and the yield of DAS is above 95% when the remaining amount of filtrate is 20 mL. The results of this study also indicate that to further improve the yield of the reaction, more efficient catalyst is needed.
2020, 37(4): 440-446
doi: 10.11944/j.issn.1000-0518.2020.04.190284
Abstract:
A red-emitting D-π-A type fluorescence probe (E)-3-(2-ethoxy-2-oxoethyl)-2-(4-((4-(methoxycarbonyl)phenyl)(phenyl)amino)styryl)benzo[d]thiazol-3-ium hexafluorophosphate salt(L) based on triphenylamine and benzothiazole salts for detecting viscosity was designed and synthesized, which was fully characterized by modern analytical testing methods. The systematic investigations indicated that probe L displayed a strong fluorescence emission at about 630 nm in viscous media, which could minimize the background noises effectively and improve the signal-to-noise(S/N) ratio of biological imaging. Probe L exhibited great sensitivity to viscosity. Moreover, probe L showed a good linear relationship (R2=0.9934) between the fluorescence intensity response (log (I/I0)) and viscosity (log η). Besides, probe L exhibited a good selectivity and could serve as a fluorescent probe for sensing viscosity without being interfered by polarity and other analytes. Furthermore, biological experimental indicated that probe L possesses low cytotoxicity, which can be applied to the fluorescence imaging of intracellular microenvironment viscosity.
A red-emitting D-π-A type fluorescence probe (E)-3-(2-ethoxy-2-oxoethyl)-2-(4-((4-(methoxycarbonyl)phenyl)(phenyl)amino)styryl)benzo[d]thiazol-3-ium hexafluorophosphate salt(L) based on triphenylamine and benzothiazole salts for detecting viscosity was designed and synthesized, which was fully characterized by modern analytical testing methods. The systematic investigations indicated that probe L displayed a strong fluorescence emission at about 630 nm in viscous media, which could minimize the background noises effectively and improve the signal-to-noise(S/N) ratio of biological imaging. Probe L exhibited great sensitivity to viscosity. Moreover, probe L showed a good linear relationship (R2=0.9934) between the fluorescence intensity response (log (I/I0)) and viscosity (log η). Besides, probe L exhibited a good selectivity and could serve as a fluorescent probe for sensing viscosity without being interfered by polarity and other analytes. Furthermore, biological experimental indicated that probe L possesses low cytotoxicity, which can be applied to the fluorescence imaging of intracellular microenvironment viscosity.
2020, 37(4): 447-454
doi: 10.11944/j.issn.1000-0518.2020.04.190231
Abstract:
Silane imidazolium ionic liquids (ILs) with different alkyl substituted groups (C1, C2 and C4) on the cations and bis(trifluoromethane)sulfonimide ions ([NTf2]-) as the anions were synthesized as the stationary phase for packed column gas chromatography. The silane-based imidazolium ILs are strong polar stationary phases. The cation structure influences the thermal stability, polarity and separation properties. The separation behavior of 1-butyl-3-[(3-trimethoxysilyl)-propyl]imidazolium bis(trifluoromethane)sulfonimide ([PBIM] NTf2) is better than that of other IL stationary phases. The [PBIM] NTf2 stationary phase was further evaluated using solvation parameter model. The interaction mechanism between stationary phase and components as well as separation properties of [PBIM] NTf2 column for different chemical compounds were investigated. The results indicate that hydrogen-bond basicity and dipole-dipole interactions as the main intermolecular forces exist between [PBIM] NTf2 and components. The stationary phase shows a good selectivity for the components such as Grob test mixture, alkanes, alcohols, esters and amines.
Silane imidazolium ionic liquids (ILs) with different alkyl substituted groups (C1, C2 and C4) on the cations and bis(trifluoromethane)sulfonimide ions ([NTf2]-) as the anions were synthesized as the stationary phase for packed column gas chromatography. The silane-based imidazolium ILs are strong polar stationary phases. The cation structure influences the thermal stability, polarity and separation properties. The separation behavior of 1-butyl-3-[(3-trimethoxysilyl)-propyl]imidazolium bis(trifluoromethane)sulfonimide ([PBIM] NTf2) is better than that of other IL stationary phases. The [PBIM] NTf2 stationary phase was further evaluated using solvation parameter model. The interaction mechanism between stationary phase and components as well as separation properties of [PBIM] NTf2 column for different chemical compounds were investigated. The results indicate that hydrogen-bond basicity and dipole-dipole interactions as the main intermolecular forces exist between [PBIM] NTf2 and components. The stationary phase shows a good selectivity for the components such as Grob test mixture, alkanes, alcohols, esters and amines.
2020, 37(4): 455-463
doi: 10.11944/j.issn.1000-0518.2020.04.190249
Abstract:
The lemongrass plant contains a huge amount of essential oil which had a wide application. It was found that there were great differences between the stem and leaves of lemongrass in essential oil yields. In this paper, we investigated the differential expression protein spots in two-dimensional electrophoresis (2-DE) of lemongrass stem and leaves via K-means clustering. Three parts of lemongrass, flag-leaf, mature-leaf and stem, which were significant different in essential oil contents, were taken to detect the total protein content and analysize the protein expression profiles by 2-DE. K-means clustering of different protein spots was carried out on abundance, isoelectric point (pI) and molecular mass. It was found that the total protein content of flag-leaf and mature-leaf was higher than that of stem, and the total protein content of flag leaf and mature-leaf had little difference. Cluster analysis of the abundance, isoelectric point (pI) and molecular mass of different protein spots in three parts of lemongrass showed that the up-regulated protein spots in flag-leaf and stem were sensitive to molecular weight changes, and the up-regulated protein spots in mature-leaf were more sensitive to abundance changes. Based on this, 15 protein pots were selected and 9 proteins were successfully identified by matrix-assisted laser desorption/ionization (MALDI-TOF/TOF-MS). Our study provides new basic information and research perspective of protein pathway of Cymbopogon citratus essential oil metabolism.
The lemongrass plant contains a huge amount of essential oil which had a wide application. It was found that there were great differences between the stem and leaves of lemongrass in essential oil yields. In this paper, we investigated the differential expression protein spots in two-dimensional electrophoresis (2-DE) of lemongrass stem and leaves via K-means clustering. Three parts of lemongrass, flag-leaf, mature-leaf and stem, which were significant different in essential oil contents, were taken to detect the total protein content and analysize the protein expression profiles by 2-DE. K-means clustering of different protein spots was carried out on abundance, isoelectric point (pI) and molecular mass. It was found that the total protein content of flag-leaf and mature-leaf was higher than that of stem, and the total protein content of flag leaf and mature-leaf had little difference. Cluster analysis of the abundance, isoelectric point (pI) and molecular mass of different protein spots in three parts of lemongrass showed that the up-regulated protein spots in flag-leaf and stem were sensitive to molecular weight changes, and the up-regulated protein spots in mature-leaf were more sensitive to abundance changes. Based on this, 15 protein pots were selected and 9 proteins were successfully identified by matrix-assisted laser desorption/ionization (MALDI-TOF/TOF-MS). Our study provides new basic information and research perspective of protein pathway of Cymbopogon citratus essential oil metabolism.
2020, 37(4): 464-470
doi: 10.11944/j.issn.1000-0518.2020.04.190257
Abstract:
Traditional ultraviolet (UV) inks have the advantages of low viscosity, fast curing speed, and wide application range. However, there are disadvantages such as use of organic solvents and low degree of crosslinking. In this paper, styrene and acrylic acid are copolymerized by free radical polymerization to form aqueous prepolymer. Secondly, a tetraacrylate functional reactive diluent is prepared from glycidyl methacrylate (GMA) and ethylenediamine. Finally, a UV-curable aqueous ink is prepared using an aqueous prepolymer, a reactive diluent, a photoinitiator, and a small amount of solvent. The effects of the type and mass fraction of the photoinitiator, the relative molecular mass and mass fraction of the prepolymer, the structure and mass fraction of the reactive diluent on the photocuring speed and wear resistance of the UV ink are investigated. When the prepolymer has a relative molecular mass of 1.98×105 and a mass fraction of 30%, a photoinitiator mass fraction of 4%, a reactive diluent functional group number of 4, and a mass fraction of 40%, the photocuring rate of the UV aqueous ink is 1 s. After 50 times the wear quality loss is 9%. The UV aqueous ink prepared by the method can be used for flexographic printing, gravure printing, and digital printing.
Traditional ultraviolet (UV) inks have the advantages of low viscosity, fast curing speed, and wide application range. However, there are disadvantages such as use of organic solvents and low degree of crosslinking. In this paper, styrene and acrylic acid are copolymerized by free radical polymerization to form aqueous prepolymer. Secondly, a tetraacrylate functional reactive diluent is prepared from glycidyl methacrylate (GMA) and ethylenediamine. Finally, a UV-curable aqueous ink is prepared using an aqueous prepolymer, a reactive diluent, a photoinitiator, and a small amount of solvent. The effects of the type and mass fraction of the photoinitiator, the relative molecular mass and mass fraction of the prepolymer, the structure and mass fraction of the reactive diluent on the photocuring speed and wear resistance of the UV ink are investigated. When the prepolymer has a relative molecular mass of 1.98×105 and a mass fraction of 30%, a photoinitiator mass fraction of 4%, a reactive diluent functional group number of 4, and a mass fraction of 40%, the photocuring rate of the UV aqueous ink is 1 s. After 50 times the wear quality loss is 9%. The UV aqueous ink prepared by the method can be used for flexographic printing, gravure printing, and digital printing.
2020, 37(4): 471-480
doi: 10.11944/j.issn.1000-0518.2020.04.190247
Abstract:
In order to optimize the structure of graphitic carbon nitride (g-C3N4) photocatalyst and improve its degradation performance to pollutants, two-dimensional graphitic carbon nitride (2D-C3N4) was prepared by high temperature calcination and thermal oxidation stripping with melamine as the precursor. Ag/2D-C3N4/rGO(reduced graphene oxide) composite photocatalyst was synthesized by photoreduction method. The material obtained was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption desorption isotherm curve (BET). Taking ceftriaxone sodium as the target pollutant, the effects of pH, catalyst dosage and initial concentration of ceftriaxone sodium on the adsorption and degradation properties of the catalyst were investigated, and the degradation reaction mechanism was explored. When pH=6.0, the amount of catalyst is 0.3 g/L, and the initial concentration of ceftriaxone sodium is 10 mg/L, the degradation rate of ceftriaxone sodium can reach 89.1%. The catalyst has strong stability and can be used for treating wastewater containing cephalosporin antibiotics.
In order to optimize the structure of graphitic carbon nitride (g-C3N4) photocatalyst and improve its degradation performance to pollutants, two-dimensional graphitic carbon nitride (2D-C3N4) was prepared by high temperature calcination and thermal oxidation stripping with melamine as the precursor. Ag/2D-C3N4/rGO(reduced graphene oxide) composite photocatalyst was synthesized by photoreduction method. The material obtained was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption desorption isotherm curve (BET). Taking ceftriaxone sodium as the target pollutant, the effects of pH, catalyst dosage and initial concentration of ceftriaxone sodium on the adsorption and degradation properties of the catalyst were investigated, and the degradation reaction mechanism was explored. When pH=6.0, the amount of catalyst is 0.3 g/L, and the initial concentration of ceftriaxone sodium is 10 mg/L, the degradation rate of ceftriaxone sodium can reach 89.1%. The catalyst has strong stability and can be used for treating wastewater containing cephalosporin antibiotics.
2020, 37(4): 481-488
doi: 10.11944/j.issn.1000-0518.2020.04.190268
Abstract:
By introducing polyoxotungstates [PW12O40]3- into the Co-bbp(bbp:3, 5-bis(pyrid-4-yl)pyridine) system, a new polyoxometalate-based inorganic-organic hybrid, [Co(Hbbp)2][PW12O40] (1), was synthesized under the hydrothermal condition. The structure was determined by single-crystal X-ray diffraction analysis. Structural analyses show that metal Co coordinates with bbp to form the metal-organic monomer which stacks through π…π bond between ligands to from a two-dimensional layered framework structure. [PW12O40]3- is embedded into the gaps as the template, forming a multi-acid-based supramolecular compound. The properties of compound 1 was investigated, and the results indicate that the degradation ratio of rhodamine B (RhB) reaches 94% after 120 min (under visible light). In addition, compound 1 is a multifunctional catalyst and has good electrocatalytic activities towards the reduction of NO2- and oxidation of ascorbic acid.
By introducing polyoxotungstates [PW12O40]3- into the Co-bbp(bbp:3, 5-bis(pyrid-4-yl)pyridine) system, a new polyoxometalate-based inorganic-organic hybrid, [Co(Hbbp)2][PW12O40] (1), was synthesized under the hydrothermal condition. The structure was determined by single-crystal X-ray diffraction analysis. Structural analyses show that metal Co coordinates with bbp to form the metal-organic monomer which stacks through π…π bond between ligands to from a two-dimensional layered framework structure. [PW12O40]3- is embedded into the gaps as the template, forming a multi-acid-based supramolecular compound. The properties of compound 1 was investigated, and the results indicate that the degradation ratio of rhodamine B (RhB) reaches 94% after 120 min (under visible light). In addition, compound 1 is a multifunctional catalyst and has good electrocatalytic activities towards the reduction of NO2- and oxidation of ascorbic acid.
