Original scientific paper

Copper(II) and Cobalt(ll) Complexes with L-Threonine and L-allo- Threonine: Potentiometric and CD-Spectroscopic Study

Z. Kralj ; Institute for Medical Research and Occupational Health, 41001 Zagreb, Croatia, Yugoslavia
N. Paulić ; Institute for Medical Research and Occupational Health, 41001 Zagreb, Croatia, Yugoslavia
N. Raos ; Institute for Medical Research and Occupational Health, 41001 Zagreb, Croatia, Yugoslavia
Vl. Simeon ; Institute for Medical Research and Occupational Health, 41001 Zagreb, Croatia, Yugoslavia

Abstract

Stability constants of cobalt(II) and copper(II) complexes with
L-threonine and L-aHo-threonine as well as ligands' acid dissociation
constants were determined by potentiometry. Circular-dichroisrrt
spectra of the investigated complex solutions were recorded in a
broad pH range and resolved into the contributions of individual
dichroic species applying a recently developed regression procedure
with iterative weighting. Two new deprotonated cobalt(II)
complexes, [Co(Thr)2H _ 1]- and [Co(aThrl2H - ir, were detected and
characterized by stability constants and CD spectra. New CD bands
were found in the UV region for the complexes of both metals.
Tentative structure types for the deprotonated as well as for their
parent complexes were inferred from the stability data.

Keywords

Hrčak ID:

194250

URI

https://hrcak.srce.hr/194250

Publication date:

15.12.1982.

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