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Mariana Mitewa

Bio: Mariana Mitewa is an academic researcher from Sofia University. The author has contributed to research in topics: Ligand & Denticity. The author has an hindex of 18, co-authored 138 publications receiving 1395 citations. Previous affiliations of Mariana Mitewa include Bulgarian Academy of Sciences & University of Zagreb.


Papers
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TL;DR: Mecanisme de formation des complexes de Cr(V). Structure et liaison. Photochimie de la reduction of Cr(VI) as discussed by the authors, and the reduction de Cr

113 citations

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TL;DR: A preferable octahedral environment around the transition metal centers is observed in polar solvents while the complexes retain their tetrahedral structure in non-polar media.

78 citations

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TL;DR: In this paper, the structure of mononuclear Au(III) complexes of the peptides H-His-Met-OH (D) and H-Gly-Gli-Met Met-OH(T) and their N-protected forms Ac-D and Ac-T were structurally characterized by means of IR, MS and NMR.
Abstract: Mononuclear Au(III) complexes of the peptides H-His-Met-OH (D) and H-Gly-Gly-Met-OH (T) and their N-protected forms Ac-His-Met-OH (Ac-D) and Ac-Gly-Gly-Met-OH (Ac-T) were structurally characterized by means of IR, MS and NMR. In the complexes with dipeptides [AuLCl2]Cl (L = D or Ac-D), Au(III) is coordinated through S and imidazole N atoms from methionine and histidine fragments of the ligands forming macrochelate rings at mol ratio Au : L = 1 : 1. Additionally, Au(III) is coordinated by two terminal chloride ions in a square-planar arrangement. In complexes with the tripeptides [AuL′Cl] (L′ = T or Ac-T), however, the metal ion is coordinated in a tridentate fashion, through S and two N atoms, also at mol ratio M : L = 1 : 1. The fourth position of Au(III) is occupied by a Cl− ligand.

44 citations

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TL;DR: In this article, the pulsed laser photolysis (excimer laser, XeCl; 308 nm) of the PtCl 6 2−creatinine-methanol system was studied.
Abstract: The pulsed laser photolysis (excimer laser, XeCl; 308 nm) of the PtCl 6 2− —creatinine—methanol system was studied. The formation of an intermediate Pt III species (PtCl 5 2− cr, where cr = creatinine) was demonstrated and its decay kinetics were examined. Some kinetic and thermodynamic data of the photoinduced reaction were determined. The photolysis of the same system using stationary irradiation was also investigated allowing the end product of the reaction to be determined.

35 citations

Journal ArticleDOI
Mariana Mitewa1
TL;DR: In this article, the ability of the important bioligands creatinine and creatine to form various types of complexes with different metal ions is summarized and the crucial role of the nature of the reaction medium in complex formation with these ligands is emphasized.

34 citations


Cited by
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1,365 citations

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882 citations

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TL;DR: The spectrum of gold complexes described as antiproliferative compounds comprises a broad variety of different species including many phosphine complexes as well as gold in different oxidation states.

700 citations

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TL;DR: This contribution aims at an elucidation of some of the underlying principles of heavy and transition metal ion-enhanced emission by analyzing various systems published by other researchers as well as own work.

494 citations

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TL;DR: Guanidines have attracted increasing attention as electronically and sterically flexible ligands as mentioned in this paper, exhibiting a variety of coordination modes and a range of donor properties leading to compatibility with a remarkably wide range of metal ions from all parts of the periodic table.

476 citations