Potentiometeric study of protonation and complex formation of some amino acids with Zn (II) , Co(II) and Ni (II) in aqueous solution

Journal of the Iranian Chemical Research

مقاله 4، دوره 2، شماره 4، اسفند 2009، صفحه 247-255   

نویسندگان

Mohammad Mazloum-Ardakani^{* 1}؛ Sharam Lotfi²؛ Jahan B. Ghasemi³

¹Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran

²Department of Chemistry, Faculty of Sciences, Payame Noor University (PNU), Iran

³Department of Chemistry, Faculty of Sciences, K.N. Toosi University, Tehran, Iran

چکیده

The stability constants and complexation reaction between L-glutamine, L-arginine and
glycine with Zn (II) , Co (II) and Ni (II) were studied potentiometrically in aqueous solution at
25° C and μ=0.1 M KNO3. The overall stability constants log β´
s of all species are obtained by
computer refinement of pH-volume data using BEST computer program. Several models were
tested and the lowest δFIT, the best one is accepted. The main species in binary complexes MHL,
ML, ML2, MLOH, ML(OH)2 and for ternary complexes are ML1L2, ML1L2H, ML1L2OH,
ML1L2(OH)2. The order found for the resulting stability constants vary as Co (II) < Ni (II) <Zn
(II). The concentration distribution diagram was obtained with the program SPEPLOT.

کلیدواژه‌ها

L-glutamine؛ L-arginine؛ glycine؛ BEST؛ Potentiometrically؛ Nonaqueous؛ solvents

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