Speciation of ternary complexes of Ca(II), Zn(II) and Mn(II) with L-proline and L-valine in acetonitrile–water mixtures

Q3 Chemical Engineering

Chemical Speciation and Bioavailability Pub Date : 2014-01-01 DOI:10.3184/095422914X13884191074459

B. Veeraswami, P. Bhushanavathi, U. Viplavaprasad, G. Nageswara Rao

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引用次数: 1

Abstract

Abstract Chemical speciation of ternary complexes of Ca(II), Zn(II) and Mn(II) with L-proline and L-valine was studied in various concentrations (0–60% v/v) of acetonitrile–water mixtures maintaining an ionic strength of 0.16 mol L-1 at 303.0 K. Alkalimetric titrations were carried out with different relative concentrations (M: L: X = 1:2.5:2.5, 1:2.5:5.0, 1:5.0:2.5) of metal (M) to L-proline (L) to L-valine (X). Stability constants of ternary complexes were calculated and various models were refined with MINIQUAD75. The best-fit chemical models were selected based on statistical parameters and residual analysis. The trend of the variation in the stability constants with changing dielectric constant (D) of the medium was explained based on the electrostatic interactions of the ligands, charge neutralisation, chelate effect, stacking interactions and hydrogen bonding. Distribution diagrams with pH at different compositions of aqua-organic mixtures and structures of plausible ternary complexes were also presented.

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乙腈-水混合物中Ca(II)、Zn(II)和Mn(II)与l -脯氨酸和l -缬氨酸三元配合物的形成

在303.0 K条件下，在不同浓度(0-60% v/v)的乙腈-水混合物中，离子强度为0.16 mol L-1，研究了Ca(II)、Zn(II)和Mn(II)与l -脯氨酸和l -缬氨酸的三元配合物的化学形态。以不同相对浓度(M: L: X = 1:2.5:2.5, 1:2.5:5.0, 1:5.0:2.5)的金属(M) - L-脯氨酸(L) - L-缬氨酸(X)进行碱法滴定，计算三元配合物的稳定性常数，并用MINIQUAD75对各种模型进行细化。根据统计参数和残差分析选择最适合的化学模型。从配体的静电相互作用、电荷中和、螯合效应、堆叠相互作用和氢键作用等方面解释了稳定性常数随介质介电常数(D)变化的趋势。给出了水-有机混合物在不同组成和三元配合物结构下的pH分布图。

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来源期刊

Chemical Speciation and Bioavailability 环境科学-毒理学

CiteScore

1.62

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Chemical Speciation & Bioavailability ( CS&B) is a scholarly, peer-reviewed forum for insights on the chemical aspects of occurrence, distribution, transport, transformation, transfer, fate, and effects of substances in the environment and biota, and their impacts on the uptake of the substances by living organisms. Substances of interests include both beneficial and toxic ones, especially nutrients, heavy metals, persistent organic pollutants, and emerging contaminants, such as engineered nanomaterials, as well as pharmaceuticals and personal-care products as pollutants. It is the aim of this Journal to develop an international community of experienced colleagues to promote the research, discussion, review, and spread of information on chemical speciation and bioavailability, which is a topic of interest to researchers in many disciplines, including environmental, chemical, biological, food, medical, toxicology, and health sciences. Key themes in the scope of the Journal include, but are not limited to, the following “6Ms”: Methods for speciation analysis and the evaluation of bioavailability, especially the development, validation, and application of novel methods and techniques. Media that sustain the processes of release, distribution, transformation, and transfer of chemical speciation; of particular interest are emerging contaminants, such as engineered nanomaterials, pharmaceuticals, and personal-care products. Mobility of substance species in environment and biota, either spatially or temporally. Matters that influence the chemical speciation and bioavailability, mainly environmentally relevant conditions. Mechanisms that govern the transport, transformation, transfer, and fate of chemical speciation in the environment, and the biouptake of substances. Models for the simulation of chemical speciation and bioavailability, and for the prediction of toxicity. Chemical Speciation & Bioavailability is a fully open access journal. This means all submitted articles will, if accepted, be available for anyone to read, anywhere, at any time. immediately on publication. There are no charges for submission to this journal.