Naslov
Comparative EPR study of Copper(II) Complexes with Threonine Derivatives

Autori
Noethig-Laslo, Vesna ; Paulić, Nevenka

Izvornik
Monatshefte für Chemie (0026-9247) 128 (1997), 11; 1101-1108

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
EPR; Copper(II); Amino acid; L-Threonine; L-allo-Threonine; N; N-Dimethyl-L-threonine; N; N Dimethyl-L-allo threonine

Sažetak
In order to get better insight into the structural reasons for different properties of copper(II) complexes with L-threonine, L-allo-threonine, L-N, N-dimethyl-threonine and L-N, N-dimethyl-allo-threonine, their EPR spectra were studied as a function of pH and temperature. At pD~9.4, in all complexes a change in the copper(II) coordination sphere from the "glycine" to the "hydroxy" type was observed. In the bis(L-threoninato)copper(II), the "hydroxy" type formed at pD~9.4 was found to be stablized by increasing the temperature of the solution from 280 to 320K. In all the other copper(II) complexes, the conformational change is accompained by the disruption of the Cu-N bond of one chelate ring.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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