studies on nickel(ii)-pyridoxamine-imidazole containing mixed ligand complex systems
نویسندگان
چکیده
the stability constants of species present in the systems ni(ii)-pyridoxamine(pym)(a) and ni(ii)-pyridoxamine(pym)(a)-imidazole containing ligands(b) [b = imidazole(him), benzimidazole(bim), histamine(hist) and l-histidine(his)] have been determined ph-metrically using the miniquad computer program. the existence of the species niah, nia and nia2 was proven for the ni(ii)-pym(a) system, whereas for the ni(ii)-pym(a)-b systems niabh2, niabh, niab and niab2 species were identified. the pym ligand(a) binds the metal ion via its phenolic oxygen and amino methyl nitrogen atoms in the niab and niab2 species, and the binding of ligand b in these complexes is similar to their binding in the respective binary species. the site of protonation in niabh and niabh2 species is explained. a more positive d log k values for niab compared to niab2 species is discussed. the computer simulated distribution of the complexes in solution has been evaluated. the mixed ligand pyridoxamine complex of ni(ii) with l-histidine was prepared and characterized by conventional methods.
منابع مشابه
Studies on Nickel(II)-Pyridoxamine-Imidazole Containing Mixed Ligand Complex Systems
The stability constants of species present in the systems Ni(II)-pyridoxamine(pym)(A) and Ni(II)-pyridoxamine(pym)(A)-imidazole containing ligands(B) [B = imidazole(him), benzimidazole(bim), histamine(hist) and L-histidine(his)] have been determined pH-metrically using the MINIQUAD computer program. The existence of the species NiAH, NiA and NiA2 was proven for the Ni(II)-pym(A)...
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Cl6 = 0.3269 Cl7 0.7458 Cl,10 = 0.6322 C26 = 0.6428 C18 0.2978 Ci,11 = — 0.1488 C36 = 0.6725 Cl9 = 0.4364 Cl,12 = — 0.4904 C46 = 0.1488 C27 = 0.1340 C2.10 = 0 Cö6 = 0 C28 = 0.4845 C2.11 = 0 C7.10 = 0.7260 C29 = 0.6087 C2.12 = 0 C7,ll = 0.5467 y s37 = 0.3405 C3.10 = 0.6793 ^7,12 = 0.4507 C38 = 0.0394 C3. l l = 0.6793 £8,10 0.6176 C39 == 0.2440 C3.12 = 0.2151 -8.1 1 = 0.7615 C47 = 0.1087 C4,10 = ...
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عنوان ژورنال:
iranian journal of chemistry and chemical engineering (ijcce)ناشر: iranian institute of research and development in chemical industries (irdci)-acecr
ISSN 1021-9986
دوره 23
شماره 1 2004
میزبانی شده توسط پلتفرم ابری doprax.com
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