نتایج جستجو برای: metal ion complex

تعداد نتایج: 1140454  

2012
Giorgio Anderegg Wolfgang Kläui

Stabüity Constants, Metal Ion Complexes, Oxygen Tripod Ligand The formation of metal ion complexes ML(> and ML2(>+ of the oxygen tripod ligand L~ = cyclopentadienyltris(diethylphosphito-P)cobaltate(l-) with metal ions M — Li+, Na+, K+, Mg+, Ca+, Sr+, Ba+, Mn+, Co+, Ni+, Cu+, Zn+, Cd+, Hg+, Pb+, Ag+, and La has been studied by pH titration at 25 °C in 95/5 methanol/water solutions kept at an ion...

The acidity constants of some amino acids (Am) were determined by potentiometric pH titration. The stability constants of the 1:1 complexes formed between M2+: Ca2+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+ or Zn2+ and Am2-, were determined by potentiometric pH titration in aqueous solution (I = 0.1 M, NaNO3, 25°C). The order of the stability constants was reported. It is shown that the stability of the bi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

abstract the influence of cation?? and anion?? interactions on the strength and nature of n…h hydrogen bond has been investigated by quantum chemical calculations in s-triazine…3hf complex. ab initio calculations were performed at mp2/6-311++g(d,p) level of theory. the natural bond orbital (nbo) analysis and the bader’s quantum theory of atoms in molecules (aim) were also used to elucidate t...

Journal: :Molecular Systems Design and Engineering 2023

Metal coordinating comonomers influence the transition metal complex, polymer–metal ion binding, and subsequently material properties in magnetic responsive poly(ionic liquid)s.

Journal: :journal of the iranian chemical research 0
nasser arsalani laboratory of polymer chemistry, department of organic and biochemistry, faculty of chemistry, university of tabriz, tabriz, iran elnaz ghasemi laboratory of polymer chemistry, department of organic and biochemistry, faculty of chemistry, university of tabriz, tabriz, iran roghayeh rakh laboratory of polymer chemistry, department of organic and biochemistry, faculty of chemistry, university of tabriz, tabriz, iran ali akbar entezami laboratory of polymer chemistry, department of organic and biochemistry, faculty of chemistry, university of tabriz, tabriz, iran

chelating resins based on polyacrylonitrile and diethylenetriamine (pan-dta) wereprepared through the simple reaction of polyacrylonitrile with various volume percents ofdiethylenetriamine (dta), (25, 50, 75 and 100). the prepared resins were applied to removeheavy metal ions such as cu(ii), zn(ii) and cd(ii) from aqueous solutions. the sorptionbehaviors of the resins for these metal ions were ...

Journal: :Molecules 2007
Regina M S Pereira Norma E D Andrades Niraldo Paulino Alexandra C H F Sawaya Marcos N Eberlin Maria C Marcucci Giovani Marino Favero Estela Maria Novak Sérgio Paulo Bydlowski

The antioxidant activity of flavonoids is believed to increase when they are coordinated with transition metal ions. However, the literature on this subject is contradictory and the outcome seems to largely depend on the experimental conditions. In order to understand the contribution of the metal coordination and the type of interaction between a flavonoid and the metal ion, in this study a ne...

Journal: :Physical chemistry chemical physics : PCCP 2012
Xu Zhang Yi Chen

Photo-controlled metal-ion (Zn(2+) and Cd(2+)) release in aqueous micelle solution (tris-HCl, pH = 7.4) has been described using 2-((2-mercaptophenylimino)methyl) phenol as ligand. It is found that both the ligand-Zn complex (1) and the ligand-Cd complex (2) are stable in micelle solution, and Zn(2+) (Cd(2+)) can be released from the complex with 365 nm light trigger. Accompanying the metal-ion...

Journal: :research in pharmaceutical sciences 0
m amanlou s keivani b sadri o gorban-dadras e souri

in the present study, a simple and sensitive extractive spectrophotometric method is described for determination of buspirone. the method is based on the reaction of buspirone and bromocresol green. the ion-pair complex was quantitatively extracted into chloroform at ph 2.3 followed by spectrophotometric determination at 415 nm. the complex was stable up to 2 days and obeyed beer's law over the...

Journal: :iranian journal of pharmaceutical sciences 0
massoud amanlou department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran effat souri department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran shiva izady department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran hassan farsam department of medicinal chemistry, faculty of pharmacy, and pharmaceutical sciences research center, tehran university of medical sciences, tehran, iran

a simple and sensitive extractive spectrophotometric method is described for determination of tropicamide. the method is based on the reaction of tropicamide and bromocresol green. the ion-paired colored complex was extracted with chloroform at ph 3. the extracted complex showed maximum absorbance at 423 nm. the complex was stable up to 2 days and obeyed beer's law over the concentration r...

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