2009 Volume 20 Issue 6

A new method for preparing (2Z, 4Z, 6Z)-diethyl-4,5-oxepinedicarboxylates and some 1H-azepine analogues
Di Zao Li , Zhong Fei Zheng , Zhi Yun Kang , De Quan Yu
2009, 20(6): 635-639  doi: 10.1016/j.cclet.2009.02.011
[Abstract](161) [FullText HTML] [PDF 296KB](0)
Abstract:
A new method for preparing (2Z, 4Z, 6Z)-4,5-diethyloxepinedicarboxylate by one-step is described. The synthesis of several oxepines and azepines derivatives was carried out by the reaction of substituted furans or pyrroles with diethyl acetylenedicarboxylate in boiling toluene. The effect factors for this reaction were discussed and reaction condition was optimized.
One-step synthesis of inherently chiral p-tert-butylcalix[4]azacrown
Shao Yong Li , Bei Sun , Zhi Chao Xiao , Ming Hui Huang , Wei Xue Xie , Jun Min Liu
2009, 20(6): 640-642  doi: 10.1016/j.cclet.2009.01.019
[Abstract](179) [FullText HTML] [PDF 245KB](0)
Abstract:
A one-step procedure is developed to synthesize inherently chiral p-tert-butylcalix[4]azacrown 1 through etherification between p-tert-butylcalix[4]arene and compound 3, which can be amplified to efficiently prepare more inherently chiral calix[4]arenes in ABHH substitution pattern.
Total synthesis of glypetelotine
Xiang Hong Huang , Xu Feng Lin , Su Qin Chen , Yan Guang Wang
2009, 20(6): 643-644  doi: 10.1016/j.cclet.2009.02.005
[Abstract](169) [FullText HTML] [PDF 194KB](0)
Abstract:
A total synthesis of glypetelotine, the first sulphur-containing indole alkaloid from the leaf extracts of Glycosmis petelotii collected in the north of Vietnam, was described from indole through 6 steps. The structure of the glypetelotine was confirmed by IR, 1H NMR, 13C NMR and MS analysis. The spectral data of synthetic compound was identical with those of natural compound.
Synthesis of bis-ANS fluorescence probe in ionic liquids
Wen Lu Liu , Fa Qin Jiang , Jing Bao Liu , Jian Cun Zhang , Lei Fu
2009, 20(6): 645-647  doi: 10.1016/j.cclet.2009.02.010
[Abstract](175) [FullText HTML] [PDF 232KB](0)
Abstract:
A new application of ionic liquids in the preparation of fluorescence probe 5,50'-bis-8-phenylamino-1-naphthylsulfonate (bis-ANS) is represented. The method for the preparation of fluorescence probe bis-ANS in alkyl imidazolium cationic liquids under acidic conditions is described. The effects on reaction yields under different concentration of sodium nitrite and different ionic liquid were studied and good yields were achieved.
Synthesis of (S) and (R)-tilisolol hydrochloride
Shan Qian , Xiao Juan Ye , Fan Zheng , Li Yang , Yong Wu
2009, 20(6): 648-650  doi: 10.1016/j.cclet.2008.12.048
[Abstract](169) [FullText HTML] [PDF 232KB](0)
Abstract:
Tilisolol hydrochloride 1, a non-selective β-adrenoceptor blocker, was developed as a drug for the treatment of hypertension and angina pectoris. The optical active forms of 1, 1a and 1b were synthesized from inexpensive phthalic anhydride 2 in eight steps with 13% (S) and 15% (R) overall yield.
PEG-SO3H as catalyst for the Beckmann rearrangement and dehydration of oximes
Xi Cun Wang , Lei Li , Zheng Jun Quan , Hai Peng Gong , He Lin Ye , Xiao Feng Cao
2009, 20(6): 651-655  doi: 10.1016/j.cclet.2009.02.004
[Abstract](162) [FullText HTML] [PDF 543KB](0)
Abstract:
Under mild conditions, conversion of a variety of ketoximes and aldoximes to their corresponding amides and nitriles proceeded in the presence of PEG-SO3H with high yields.
Synthesis of 2,20'-arylmethylene bis (3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) in aqueous medium at room temperature
Mohammad Bayat , Hossien Imanieh , Seydeh Hajar Hossieni
2009, 20(6): 656-659  doi: 10.1016/j.cclet.2008.12.050
[Abstract](160) [FullText HTML] [PDF 228KB](0)
Abstract:
The reaction of dimedone with various aromatic aldehydes produces 2,2'-arylmethylene bis (3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) in excellent yields. The reactions occur in water as solvent at room temperature and avoiding the addition of any catalyst. The workup procedure is very simple and the products do not required further purification.
The synthesis and biological evaluation of a series of novel 2-COOC2H5/COONa substituted 1,5-benzothiazepine derivatives as antimicrobial agents
Ping Zhang , Lan Zhi Wang , Hui Shu Wu , Jia Ming Lan , Yuan Li , Yong Xiang Wang
2009, 20(6): 660-662  doi: 10.1016/j.cclet.2009.01.003
[Abstract](154) [FullText HTML] [PDF 218KB](0)
Abstract:
A series of novel 1,5-benzothiazepine derivatives containing COOC2H5/COONa groups at the C(2)-position were synthesized and evaluated for their antifungal and antibacterial activities by both disc diffusion and minimal inhibition concentration (MIC) methods. Most of the compounds have been shown to have moderate to good antibacterial activity against S. aureus, S. epidermidis and excellent antifungal activity against C. albicans.
Ferric hydrogensulfate catalyzed aerobic oxidative coupling of 2-naphthols in water or under solvent free conditions
Hossein Eshghi , Mehdi Bakavoli , Hassanali Moradi
2009, 20(6): 663-667  doi: 10.1016/j.cclet.2008.12.045
[Abstract](162) [FullText HTML] [PDF 437KB](2)
Abstract:
The symmetric oxidative coupling reactions of 2-naphthol derivatives with both ferric hydrogensulfate in water and silica ferric hydrogensulfate in solvent free conditions were carried out. The advantages of this green procedure are:inexpensive catalyst or cocatalyst,reusability of catalyst, organic solvent-free procedures and simple workup.
Ureido-modification of the resin-bound LHRH analogue with N,N'-carbonyldiimidazole
Yong Qing Gao , Ning Zhou , Yu Jian Lv , Mao Shen Cheng , Ke Liang Liu
2009, 20(6): 668-671  doi: 10.1016/j.cclet.2009.01.010
[Abstract](153) [FullText HTML] [PDF 593KB](0)
Abstract:
The ureido-modification of the resin-bound a luteinizing hormone releasing hormone(LHRH) analogue was investigated by CDI-activating method.The amino group at the side chain of LHRH analogue could be transformed into various substituted urea moieties in high yields. However,is its teminal amino group was partially converted to a hydantoin stucture due to the Natom of the adjacent amide bond.
Catalyst-free and solvent-free method for the synthesis of quinoxalines under microwave irradiation
Jian Feng Zhou , Gui Xia Gong , Kun Bao Shi , San Jun Zhi
2009, 20(6): 672-675  doi: 10.1016/j.cclet.2009.02.007
[Abstract](156) [FullText HTML] [PDF 217KB](0)
Abstract:
A facile procedure for the synthesis of quinoxalines is being reported starting from benzil and 1,2-diaminobenzene. The reactions were carried out catalyst-free, solvent-free and under microwave irradiation conditions in high yield (84-98%) with short time (3-6 min) and environmental benign, as well as convenient operation. The structures of all the compounds have been confirmed on the basis of their IR, 1H NMR, and/or 13C NMR, mass spectral data.
Gallium trichloride-catalyzed conjugate addition of indole and pyrrole to α,β-unsaturated ketones in aqueous media
Rong Xu , Jin Chang Ding , Xi An Chen , Miao Chang Liu , Hua Yue Wu
2009, 20(6): 676-679  doi: 10.1016/j.cclet.2009.01.028
[Abstract](164) [FullText HTML] [PDF 231KB](0)
Abstract:
Michael addition of indole and pyrrole to a variety of α, β-unsaturated ketones was efficiently promoted by a catalytic amount of GaCl3 in aqueous media to afford the corresponding products in good to excellent yields.
Synthesis and biological evaluation of novel steroid-linked nitrogen mustards
Hua Bing Zhang , Ji Jun Xue , Xiao Long Zhao , De Gang Liu , Ying Li
2009, 20(6): 680-683  doi: 10.1016/j.cclet.2009.01.023
[Abstract](163) [FullText HTML] [PDF 357KB](0)
Abstract:
Two novel steroid-linked nitrogen mustard conjugates 1a and 1b were synthesized by using estrogenic acid 4 coupled with aniline mustard 8 and phenol mustard 13 in an esterification or amidation procedure. Preliminary cytotoxic screening on cancer cell lines in vitro showed that, the steroid-ester linked nitrogen mustard conjugate 1a exhibited obvious increasing of activities.
A new monosaccharide from Swertia punicea Hemsl.
Luan Yuan Tian , Jia Chun Chen , Jin Bo Fang , Qun Zhou , Xue Bai , Jian Qiu Zhou , Xiang Hong Chen
2009, 20(6): 684-686  doi: 10.1016/j.cclet.2009.02.006
[Abstract](174) [FullText HTML] [PDF 205KB](0)
Abstract:
A new compound named 1-hydrate, 3-deoxy-a-D-tagatofuranose was isolated from Swertia punicea Hemsl. The structure of compound was determined by 1D and 2D NMR, HRESIMS techniques.
A new panaxadiol from the acid hydrolysate of Panax ginseng
Li Na Tao , Qin Meng , Jian Yuan Yin , Rui Xing , Hao Ran Guo
2009, 20(6): 687-689  doi: 10.1016/j.cclet.2009.01.015
[Abstract](169) [FullText HTML] [PDF 290KB](0)
Abstract:
A new panaxadiol (compound 1) was obtained from the acid hydrolysate of the total ginsenosides of Panax ginseng C. A. Meyer (Araliaceae). On the basis of spectroscopic data and single-crystal X-ray diffraction data, its chemical structure was elucidated to be dammar-(E)-20(22)-ene-3b,12β,25-triol.
Two new triterpenoid saponins from Rhaponticum uniflorum
Yong Hong Zhang , Ying Wu , Li Yang , Zhong Li Liu , Dong Liang Cheng
2009, 20(6): 690-693  doi: 10.1016/j.cclet.2009.02.009
[Abstract](154) [FullText HTML] [PDF 232KB](0)
Abstract:
Two new triterpenoid saponins were isolated from the roots of Rhaponticum uniflorum. Their structures were elucidated as 3-O-[β-D-glucopyranosyl]-ilexolic acid-28-O-[β-D-glucopyranosyl] ester 1 and 3-O-[β-D-glucopyranosyl]-urs-12, 19 (29)-dien-oic acid-28-O-[β-D-glucopyranosyl] ester 2 mainly by 1D, 2D NMR techniques and chemical methods.
A new superoxide-generation inhibitor from rhizome of Anemone raddeana Regel
Jin Cai Lu , Bei Bei Xu , Song Gao , Hiroyuki Kodama
2009, 20(6): 694-697  doi: 10.1016/j.cclet.2008.12.037
[Abstract](154) [FullText HTML] [PDF 222KB](0)
Abstract:
A new triterpenoid saponins, raddeanoside R19 (1) was isolated from the rhizome of Anemone raddeana Regel. The effects of raddeanoside R19 on superoxide generation in human neutrophil were evaluated. The compound suppressed the superoxide generation induced by N-formyl-methionyl-leucyl-phenylalanine (fMLP), phorbol 12-myristate 13-acetate (PMA) and arachidonic acid (AA) in a different concentration-dependent manner.
Three new C20-diterpenoid alkaloids from Delphinium anthriscifolium var. savatieri
Xiao Yu Liu , Qiao Hong Chen , Feng Peng Wang
2009, 20(6): 698-701  doi: 10.1016/j.cclet.2008.12.056
[Abstract](156) [FullText HTML] [PDF 261KB](0)
Abstract:
Three new C20-diterpenoid alkaloids, designated as anthriscifolmines A-C (1-3), together with two known alkaloids denudatine and delgramine, were isolated from the whole herb of Delphinium anthriscifolium var. savatieri. The structures of these new alkaloids were elucidated on the basis of spectral data.
Two new secoiridoid glucosides from Syringa velutinai Kom.
Xue Song Feng , Yang Qu , Zhao Hua Wu , Lei Xu , Dong Song Zhang , Hui Yuan Gao , Li Jun Wu
2009, 20(6): 702-705  doi: 10.1016/j.cclet.2009.02.012
[Abstract](151) [FullText HTML] [PDF 210KB](0)
Abstract:
Chemical investigation of Syringa velutinai Kom. led to the isolation of two new secoiridoid glucosides. Their structures were identified as 6'-O-(6, 7-dihyrofoliamenthoyl)-8-epi-kingisidic acid (syrveoside A, 1) and 6'-O-menthiafoloyl-8-epi-kingisidic acid (syrveoside B, 2) on the basis of chemical and physicochemical evidence.
Photolysis of organic pollutants in wastewater with 206 nm UV irradiation
Zhao Lian Ye , Chang Qing Cao , Jin Cong He , Ren Xi Zhang , Hui Qi Hou
2009, 20(6): 706-710  doi: 10.1016/j.cclet.2008.12.033
[Abstract](166) [FullText HTML] [PDF 539KB](0)
Abstract:
A new-type UV light source (206 nm) was explored for the degradation of organic pollutants in wastewater for the first time. The degradation performances of triphenyltin chloride (TPTCl), dimethyl phthalate (DMP), as well as rhodamine B (RhB) were investigated. The results indicated that removal efficiency of 50 mg/L RhB, 60 mg/L DMP and 120 mg/L TPTCl can reach 88.6%,92.5% and 89.4% for 60 min, 50 min and 75 min, respectively. By comparison of removal efficiency, we found 206 nm is superior to 253.7 nm UV in wastewater treatment, implying it is an effective, promising, and worthwhile exploring technology to decompose organic pollutants in wastewater.
The ultratrace detection of crystal violet using surface enhanced Raman scattering on colloidal Ag nanoparticles prepared by electrolysis
Ren Ming Liu , Yi Pu Kang , Xing Fa Zi , Ming Jun Feng , Man Cheng , Min Zhen Si
2009, 20(6): 711-715  doi: 10.1016/j.cclet.2009.02.001
[Abstract](159) [FullText HTML] [PDF 819KB](0)
Abstract:
Highly active, stable and affordable surface enhanced Raman scattering (SERS) substrates were obtained by electrolyzing a mixture of AgNO3(4×10-4 mol/L) and Na3C6H5O7·H2O (6×10-5 mol/L) for 1, 2, 3 and 4 h at 7 V.With crystal violet (CV) as a test molecule, a portable Raman spectrometer with 785 nm laser excitation was employed to carry out the SERS detection. Colloidal Ag nanoparticles prepared by electrolyzing for 3 h with the particle size of (65±17) nm is a perfect SERS substrate for the ultratrace detection of CV, which displayed an enhancement factor of ca. 1.3×108 and the detection limit of CV is down to ca.10-15 mol/L (ca. 10-4 ppb) with 10-1 mol/L KBr as aggregating agent. Thus, this SERS substrate will provide a hopeful foreground in ultratrace detection. Meanwhile, it will provide a possibility to bring Raman analysis out of the laboratory to process in situ, real-time detection and identification.
Characterizing some gossypol and gossypolone Schiff's bases by studying their fragmentation patterns with electrospray ionization tandem mass spectra
Long Zhang , Xing Xin Cao , Hai Xia Jiang , Biao Jiang , Yu Xin Cui
2009, 20(6): 716-719  doi: 10.1016/j.cclet.2008.12.049
[Abstract](159) [FullText HTML] [PDF 305KB](0)
Abstract:
To investigate the structural form of gossypol and gossypolone Schiff's bases, seven relevant Schiff's bases were synthesized and the electrospray ionization-tandem mass spectrometry (ESI-MS/MS) with low-energy collision-induced dissociation was used to analyze their fragmentations. A common fragmentation pathway with the loss of RNH2 from those schiff's bases quasi-molecular ions was observed and proposed on the basis of their MS/MS spectra data. This common pathway indicated that those Schiff's bases existed mainly as the enamine form not the imine form previously showed in most reports.
Two new C-glucofuranosyl isoflavones in puerarin injection
Hai Jiang Zhang , Xiao Ping Yang , Kui Wu Wang
2009, 20(6): 720-723  doi: 10.1016/j.cclet.2009.01.018
[Abstract](160) [FullText HTML] [PDF 399KB](0)
Abstract:
Two new C-glucofuranosyl isoflavones of impurities in puerarin injection were isolated. Their structures were determined to be 8-C-α-glucofuranosyl-7, 4'-dihydroxyisoflavone and 8-C-β-glucofuranosyl-7, 4'-dihydroxy-isoflavone by chemical and spectral analysis.
A new fluorescent particle prepared by chemical stabilized phycobilisome
Min Chen , Guo Ping Ma , Li Sun
2009, 20(6): 724-728  doi: 10.1016/j.cclet.2008.12.042
[Abstract](165) [FullText HTML] [PDF 567KB](0)
Abstract:
Natural phycobilisomes (PBSs) were isolated and purified from a red macroalga, Polysiphonia urceolata, by multi-step of sucrose gradient centrifugation, and were chemically stabilized by small molecule cross-linker formaldehyde. The stabilized PBSs showed similar absorption and fluorescent properties at room temperature compared to natural PBSs and kept a steady F672/F580 value during more than 3 months of storage in 0.45 mol/L phosphate buffer (pH 6.8) or at low temperature at 77 K. The stabilized PBS migrated as a single band at mild PAGE and in 14-18 h of sucrose gradient centrifugation. All these characters indicated that the stabilized PBSs were stable, soluble, homogenous fluorescent particles with favorable spectroscopic features prepared under present conditions.
Synthesis and characterization of a-{3-[(2,3-dihydroxy) propoxy]propyl}-v-butyl-polydimethylsiloxanes
Xiao Li Zhan , Zhen Huan Luo , Qing Hua Zhang , Bi Chen , Feng Qiu Chen
2009, 20(6): 729-732  doi: 10.1016/j.cclet.2008.12.047
[Abstract](155) [FullText HTML] [PDF 249KB](0)
Abstract:
Hydrosilylation has been carried out between Si-H terminated polydimethylsiloxanes with narrow molecular weight distribution and protected 3-allyloxy-1,2-propanediol, and after subsequently alcoholyzed, α-{3-[(2,3-dihydroxy)propoxy]propyl}-ω-butyl-polydimethylsiloxanes with varying number of ((Si(CH3)2-O) unit were obtained. At each step, the produced compounds were carefully characterized. The results showed that each step was successfully carried out and target products were achieved.
The reversible addition-fragmentation chain transfer (RAFT) miniemulsion polymerization of vinyl acetate mediated by xanthate
Bo Jiang , Qing Hua Zhang , Xiao Li Zhan , Feng Qiu Chen
2009, 20(6): 733-737  doi: 10.1016/j.cclet.2008.12.023
[Abstract](150) [FullText HTML] [PDF 308KB](0)
Abstract:
The reversible addition-fragmentation chain transfer (RAFT) miniemulsion polymerization of vinyl acetate (VAc) mediated by methyl (methoxycarbonothioyl) sulfanyl acetate (MMSA) was carried out. The results showed that polymerizations initiated by AIBN and KPS proceeded in a controlled way. The RAFT miniemulsion polymerization of VAc initiated by KPS showed the shorter inhibition period, higher propagation rate coefficient and final conversion than those in experiment initiated by AIBN. When the monomer conversion reached 25%, the polydispersity index (PDI) of polymer became broad, which was related to chain transfer reaction in RAFT miniemulsion of VAc.
Preparation and properties of a POSS-containing organic-inorganic hybrid crosslinked polymer
Wang Yan Nie , Gang Li , Yang Li , Hong Yao Xu
2009, 20(6): 738-742  doi: 10.1016/j.cclet.2009.02.003
[Abstract](135) [FullText HTML] [PDF 687KB](0)
Abstract:
A novel POSS-containing organic-inorganic hybrid crosslinked polymer was prepared by hydrosilylation reaction of octahydridosilsesquioxane (T8H8) with 4,4'-bis(4-allyloxybenzoyloxy)phenyl (diene A). Its structure and property was characterized by FTIR, 29Si NMR, TGA and ellipsometer, respectively. The results show that the hybrid polymer possesses high thermal stability and low dielectric constant of 1.97 at optical frequencies.
Design,synthesis and characterization of novel biodegradable macrodiols based on poly(DL-lactic acid) and poly (p-dioxanone)
Chan Yu Zhang , Yan Feng Luo , Su Jun Wang , Zhao Liu , Yuan Liang Wang , Zhi Qing Liang
2009, 20(6): 743-746  doi: 10.1016/j.cclet.2008.12.055
[Abstract](136) [FullText HTML] [PDF 639KB](0)
Abstract:
Integrating poly(lactic acid) (PLA), glycolic acid (GA) and ethylene glycol (EG) will hopefully result in a novel copolymer that combines such advantages as fastened and controllable release rate and improved flexibility together with good biocompatibility. In this study, p-dioxanone (PDO) was employed to copolymerize with DL-lactide (LA) via ring-opening melt polymerization using Sn(Oct)2 as an initiator and ethylene glycol as a co-initiator. The obtained degradable macrodiols (HO-P(LA-co-PDO)-OH) were just such a copolymer consisting of PLA, GA and EG. 1H NMR was employed to characterize the copolymers, and the effect of PDO/LA molar ratios in the feedstock on the molecular weights of HO-P(LA-co-PDO)-OH was investigated by means of endhydroxyl analysis, 1H NMR or GPC-MALLs. The results confirmed the successful synthesis of HO-P(LA-co-PDO)-OH and revealed that one end-hydroxyl of the micarodiols was donated by LA or PDO and the other one by the co-initiator EG. In addition,the molecular weights of HO-P(LA-co-PDO)-OH increased with decreasing PDO/LA ratios.
Molecular imprinting of protein by coordinate interaction
Jun Wang , Zhen Dong Hua , Zhi Yong Chen , Yuan Zong Li , Mei Ping Zhao
2009, 20(6): 747-750  doi: 10.1016/j.cclet.2008.12.035
[Abstract](140) [FullText HTML] [PDF 210KB](0)
Abstract:
In this article, a novel strong interaction by forming complex between bovine serum albumin (BSA) and copper ion was utilized for the preparation of molecular imprinted hydrogel in aqueous solution. Results show that the inclusion of copper ion in preparation can bridge the template BSA and functional monomers together and improve the imprinting effect compared to the polymer made without copper ion added. High selectivity factor and large adsorption capacity are also observed for the obtained BSA-imprinted hydrogel.
A predictive, simple and rapid method for thermodynamic study on the binding of copper ion with Alzheimer's amyloid β peptide
G. Rezaei Behbehani
2009, 20(6): 751-754  doi: 10.1016/j.cclet.2008.12.051
[Abstract](135) [FullText HTML] [PDF 289KB](0)
Abstract:
The interaction of CuCl2 to the first 16 residues of the Alzheimer's amyliod β peptide, Ab(1-16) was studied by isothermal titration calorimetry at pH 7.2 and 37℃ in aqueous solution.
Theoretical study on the reaction of NbS+(3-,1Γ) with CO
Shi Wen Yu , Tao Hong Li , Xiao Mei Yang , Li Qing Yin , Li Feng Yao , Xiao Guang Xie
2009, 20(6): 755-758  doi: 10.1016/j.cclet.2009.02.002
[Abstract](143) [FullText HTML] [PDF 635KB](0)
Abstract:
Two possible reactions of NbS+ (3-, 1Γ) with CO in the gas phase have been studied by using B3LYP and CCSD(T) methods:the O/S exchange reaction (NbS++CO→ NbO++CS) and the S-transfer reaction (NbS++CO →Nb++COS). The two reactions have a one-step mechanism. The barriers of the O/S exchange reaction on the triplet and singlet surfaces are 51.2 and 52.4 kcal/mol,respectively, and the barriers of the S-transfer reaction are 58.3 and 78.0 kcal/mol, respectively. The results indicate that the Stransfer and the O/S exchange reaction of the 3- ground state of NbS+ are competing, but, for the S-transfer reaction, the 1G exited state is more reactive. The differences between the reactions of NbS+ (3-, 1Γ) and VS+ (3-, 1Γ) are discussed.
Application of specific ion interaction theory and parabolic models for the molybdenum(VI) and tungsten(VI) complexes with NTA and IDA at different ionic strengths
Kavosh Majlesi , Saghar Rezaienejad
2009, 20(6): 759-762  doi: 10.1016/j.cclet.2008.12.002
[Abstract](144) [FullText HTML] [PDF 320KB](0)
Abstract:
The interaction of nitrilotriacetic acid (NTA) and iminodiacetic acid (IDA) with tungsten(VI) (pH 7.5) and molybdenum(VI) (pH 6.00) has been studied in aqueous solutions at 25℃, and different ionic strengths (0.1 < I (mol dm-3) <1.0 for NaClO4) by a combination of potentiometric and UV spectroscopic(260-270 nm) measurements. Dependence on ionic strength was taken into account by using the Bronsted-Guggenheim-Scatchard specific ion interaction theory (SIT) and parabolic model. The data included in this work, together with some previously published data, make it possible to calculate parameters for dependence on ionic strength by using the aforementioned models.
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