Stability of ternary complexes of Cu(II) metal ion with 2,2'- Bipyridyl and Oxalic acid, Tyrosin, Ethylenediamine, Glycine, a - Alaline, Phenylalanine, Tryptophan
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 1
Abstract
In the present work the formation constant of ternary complexes [MAL], where M = Cu(II), A = 2,2'-Bipyridyl(2,2'-bipy) and L = Oxalic acid, Tyrosin, Ethylenediamine, Glycine, - Alaline, Phenylalanine, Tryptophan have been determined and the values of ∆logK have been calculated by using SCOG computer program. The analysis of the representative species distribution curves shows that in the pH range 1-3, metal ion Cu(II) is the major species. In the pH range 3-5, the species [MA] and [ML] is predominate. In the pH range 5-7, the species [MAL] exists. The value of logK of the complexes [Cu(2,2'-bipy)L] show more positive value when, L= tyr . This is due to the fact that the intramolecular interligand interaction involves in complex. The non-coordinated side group hydroxyphenyl ring of tyrosin comes over the pyridyl ring of 2,2'-bipyridyal and hence non-covalent hydrophobic interaction is possible. This intramolecular interligand interaction stabilizes the ternary complex, leading the more positive logK value. when L= Ethylenediamine (en), glycine(gly), -alanine (-ala), phenylalanine (ph-ala) the logK values are negative. The logK value are more negative in case of Cu(II) complexes with above ligand because of the presence of Jahn-Teller effect of the complexes.
Authors and Affiliations
M. Jahangir Alam, M. R. Ullah, Mousume Akther
Keywords
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- EP ID EP413932
- DOI 10.9790/5736-1101010104.
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