Showing papers by "Mariana Mitewa published in 1997"
TL;DR: In this paper, the structure and coordination modes of paramagnetic complexes with biuret (BiuH2) were studied using magnetochemical and spectroscopic (EPR, IR, ESCA) methods.
Abstract: New monomeric Pd(III) and dimeric (Pd(III)-Pd(II)) paramagnetic complexes with biuret (BiuH2) were synthesized and their structures and coordination modes studied using magnetochemical and spectroscopic (EPR, IR, ESCA) methods. For the monomeric species a metal to ligand ratio 1:2 was found and for the dimeric one it was 2:3. A distorted rhombic structure was suggested for the [Pd(III)(Biu)2]− species. For the dimeric complex it was accepted that one of the biuret molecules is serving as bridging ligand coordinated via both NH-groups to one of the palladium ions and via both C=O groups to the other. A distorted rhombic structure is suggested for each of the palladium ions. Referee I: W. A. Donaldson Referee II: N. M. Kostic
10 citations
TL;DR: In this article, the formation of an octahedral low-spin PdL was proved exhibiting an anisotropic 2-component EPR spectrum (g1=2.007 and gu=1.998) and effective magnetic moment μeff = 1.7 BM.
Abstract: Formation of transient Pd(III) species was established in the course of PdCL42−-bilirubin (BR) reaction in basic-water medium. Using the EPR method the formation of an octahedral low-spin PdL.2H2O complex was proved exhibiting an anisotropic 2-component EPR spectrum (g1=2.007 and gu=1.998) and effective magnetic moment μeff = 1.7 BM.
4 citations
TL;DR: In this paper, two new copper(II) complexes with physiologically active ligands containing both pyridine ring and cyclic β-diketones with different ring members were obtained with the metal to ligand ratio 1:2.
3 citations