Abstract
Speciation of binary complexes of Co(II), Ni(II) and Cu(II) with L-aspartic acid in (0–60% v/v) 1,4-dioxan (Dox)-water mixtures was studied pH metrically at 303±0.1 K and at an ionic strength of 0.16 M. The models contained ML, ML2, ML2H2, ML2H3 and ML2H4 species. The trend in the variation of stability constants with Dox content was explained on the basis of electrostatic and non-electrostatic forces. Distribution of the species with pH at different compositions of Dox-water media was also presented. KEY WORDS: Binary complexes, Stability constants, Aspartic acid, Speciation, Dioxan Bull. Chem. Soc. Ethiop. 2013, 27(3), 367-376.DOI: http://dx.doi.org/10.4314/bcse.v27i3.5
Highlights
1,4-Dioxan (Dox) is cyclic ether that exists at room temperature as a colorless liquid with a faint, pleasant ethereal odour
Simultaneous equilibria involving a variety of metal ions and amino acids are important in biological fluids [1,2,3,4,5,6]
Chemical speciation of their binary complexes is reported in the present communication
Summary
1,4-Dioxan (Dox) is cyclic ether that exists at room temperature as a colorless liquid with a faint, pleasant ethereal odour It is miscible with water, oils, and most organic solvents, including aromatic hydrocarbons. L-Aspartic acid (Asp) forms complexes with almost all the metal ions through its three binding sites. Chemical speciation of ligands with metal ions has been studied in this laboratory [7,8,9,10,11,12,13]. Speciation studies of aspartic acid with various metal ions in different media were reported earlier [14, 15]. Several literature reports have been devoted to the study of stability constants of metal-Asp complexes. Chemical speciation of their binary complexes is reported in the present communication
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