The reactivity of N-2-(4-amino-1,6-dihydro-1-methyl-5-nitroso-6-oxo-pyrimidinyl)-L-histidine towards silver(I) and zinc(II) ions

Author: Pérez-Cadenas A.   López-Garzón R.   Godino-Salido L.   Arranz-Mascarós P.   Gutiérrez-Valero D.   Carillo-Márquez T.  

Publisher: Springer Publishing Company

ISSN: 0340-4285

Source: Transition Metal Chemistry, Vol.27, Iss.2, 2002-03, pp. : 184-190

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Abstract

Reactions of N-2-(4-amino-1,6-dihydro-1-methyl-5-nitroso-6-oxopyrimidinyl)-L-histidine with Ag^I and Zn^II ions in 1/1 and 4/1 ligand-to-metal molar ratios, in aqueous media at 25 °C and 0.1 M KNO_3 and KCl ionic strength, respectively, were followed by potentiometric techniques in order to determine formation equilibria for the complex species. The spectral curves, as a function of ligand-to-metal molar ratio at established pH values, were studied and four solid phases of stoichiometry: AgL·4H_2O, Ag(HL)NO_3·1.5H_2O, AgL(OH)_2K_2·H_2O and Zn(HL)_2Cl_2·7H_2O were isolated and characterised by analytical, spectroscopic and thermal measurements.

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