Showing papers by "Mariana Mitewa published in 2006"
TL;DR: In this paper, a single-crystal X-ray structure of an iron(III) complex of 2-acetyl-1,3-indandione is resolved which reveals that a racemic mixture, composed of Δ-fac and Λ-fac stereoisomers, is formed.
11 citations
TL;DR: In this paper, the synthesis, characterization and cytotoxic activity of gold(III) complexes containing N1-acylacetamidrazones was reported and the complexes have general formula AuX3(L), where X = Cl, Br and L = amidrazone ligands.
Abstract: The synthesis, characterization and cytotoxic activity of gold(III) complexes containing N1-acylacetamidrazones is reported. The complexes have general formula AuX3(L), where X = Cl, Br and L = amidrazone ligands. In all cases, the complexes appear to be monomeric and square planar.
11 citations
Journal Article•
TL;DR: The crystal structures of four cycloalkanespiro-4'-imidazolidine-2',5'-dithiones, namely cyclopentanepiro, 4-IMIDZolidine 2, 5-dithione, cycloheptane-2,4]-nonane and cyclooctane ring assume both boat-chair and boat-boat conformations.
Abstract: The crystal structures of four cycloalkanespiro-4'-imidazolidine-2',5'-dithiones, namely cyclopentanespiro-4'-imidazolidine-2',5'-dithione {systematic name: 1,3-diazaspiro[4.4]-nonane-2,4-dithione}, C 7 H 10 N 2 S 2 , cyclohexanespiro-4'-imidazolidine-2',5'-dithione (systematic name: 1,3-diazaspiro[4.5]-decane-2,4-dithione), C 8 H 12 N 2 S 2 , cycloheptanespiro-4'-imidazolidine-2',5'-dithione (systematic name: 1,3-diazaspiro[4.6]-undecane-2,4-dithione), C 9 H 14 N 2 S 2 , and cyclooctanespiro-4'-imidazolidine-2',5'-dithione (systematic name: 1,3-diazaspiro[4.7]dodecane-2,4-dithione), C 10 H 16 N 2 S 2 , have been determined. The three-dimensional packing in all of the structures is based on closely similar chains, in which hydantoin moieties are linked through N-H···S hydrogen bonding. The size of the cycloalkane moiety influences the degree of its deformation. In the cyclooctane compound, the cyclooctane ring assumes both boat-chair and boat-boat conformations.
10 citations
TL;DR: The crystal structures of four cycloalkanespiro-4′-imidazolidine-2′,5′-dithiones, namely cyclo-pentane spiro- 4′-IMidazolicine- 2′, 5′- dithione, have been determined and the three-dimensional packing is based on closely similar chains, in which hydantoin moieties are linked through N—H⋯S hydrogen bonding.
Abstract: The crystal structures of four cycloalkanespiro-4′-imidazolidine-2′,5′-dithiones, namely cyclopentanespiro-4′-imidazolidine-2′,5′-dithione {systematic name: 1,3-diazaspiro[4.4]nonane-2,4-dithione}, C7H10N2S2, cyclohexanespiro-4′-imidazolidine-2′,5′-dithione {systematic name: 1,3-diazaspiro[4.5]decane-2,4-dithione}, C8H12N2S2, cycloheptanespiro-4′-imidazolidine-2′,5′-dithione {systematic name: 1,3-diazaspiro[4.6]undecane-2,4-dithione}, C9H14N2S2, and cyclooctanespiro-4′-imidazolidine-2′,5′-dithione {systematic name: 1,3-diazaspiro[4.7]dodecane-2,4-dithione}, C10H16N2S2, have been determined. The three-dimensional packing in all of the structures is based on closely similar chains, in which hydantoin moieties are linked through N—H⋯S hydrogen bonding. The size of the cycloalkane moiety influences the degree of its deformation. In the cyclooctane compound, the cyclooctane ring assumes both boat–chair and boat–boat conformations.
10 citations
TL;DR: In this article, a modified calix[4]arene (L) was prepared by reacting the parent calixarene with tetramethyldiamidophosphoric acid chloride, and its structure was solved by the X-ray diffraction method in the solid state and characterized in solution using 1H, 13C, 31P NMR and mass spectral (ES-MS) data.
3 citations