CHEMICAL SPECIATION OF BINARY COMPLEXES OF L-PHENYLALANINE AND MALEIC ACID WITH SOME METAL IONS IN DMF- WATER MIXTURES

WondimuTesfa Tefera, WakgariBungula Negassa, Tajedin Alansi, TegeneDesalegn Zeleke, HadguHailekiros Belay
2018 International Journal of Advanced Research  
Speciation of binary complexes of Co(II), Ni(II), and Cu(II) with Lphenylalanine and maleic acid in the presence of Dimethylformamidewater mixtures in the concentration range of 0-50% v/v DMF has been studied pH-metrically at a temperature of 303K and at an ionic strength of 0.16 mol L −1 . The selection of best fit chemical models is based on statistical parameters and residual analysis. The predominant species detected were ML, ML 2 , and ML 2 H 2 for Co(II), Ni(II), and Cu(II). The
more » ... (II). The appropriateness of the experimental conditions were verified by introducing errors deliberately. The models containing different numbers of species were refined by using the computer program MINIQUAD75. The chemical speciation was explained based on the distribution diagrams drawn using HYSS HYPERQUAD. The trend in variation of stability constants of the complexes with dielectric constant of the medium was attributed for the formation and possible structures of the complex species presented. Copy Right, IJAR, 2018,. All rights reserved.
doi:10.21474/ijar01/7660 fatcat:cwn7brhahfe53pikeeriyezewi