Showing papers by "Milan Melnik published in 2010"
TL;DR: A new complex of unusual composition [Cu(3-O2Nbz)2(nia)(H2O)2] has been prepared and studied together with two other complexes of composition.
27 citations
TL;DR: The crystal structure of Zn2(benzoato)4(caffeine)2]·(cane)2 was determined by direct method and Fourier technique.
Abstract: The crystal structure of [Zn2(benzoato)4(caffeine)2]·(caffeine)2 was determined by direct method and Fourier technique. The structure was refined by full-matrix least-squares method to a weighted R factor of 0.0582. The structure consists of centrosymmetric dimeric units where the two zinc(II) atoms are coordinated by four bridging benzoates in a syn–syn arrangement and two caffeine ligands at the apices of a bicapped square prism. Remaining two caffeines are bound only by hydrogen bonds. The Zn–Zn distance is 2.961(1) A. The Zn(II) atoms are displaced by 0.365 A from the basal plane containing four oxygen atoms towards the apical caffeine molecules. The dimeric structure of the complex is consistent with spectrum and thermal data. The structural data are compared with those found in similar [Zn2(RCOO)4(NL)2] complexes. The crystal structure of [Zn2(benzoato)4(caffeine)2]·(caffeine)2 consist of centrosymmetric dimeric units where the two zinc(II) atoms are coordinated by four bridging benzoates in a syn-syn arrangement and two caffeine ligands at the apices of a bicapped square prism. The dimeric structure of the complex is consistent with spectrum and thermal data.
4 citations
TL;DR: The bonding properties of thiocyanate groups of over one hundred copper species, studied by X-ray analysis, were analyzed in this article, where it was shown that the bonding properties depend on the size of the positive charge on the copper atom.
Abstract: The bonding properties of thiocyanate groups of over one hundred copper species, studied by X-ray analysis were analysed. It is shown that the bonding properties of thiocyanate groups in heterogeneous copper thiocyanate complexes depend on the size of the positive charge on the copper atom.
4 citations
3 citations
TL;DR: The coordination chemistry of iron covers a wide field, as shown by a survey covering the crystallographic and structural data of almost one thousand and three hundred coordination complexes as mentioned in this paper, and about 6.7% of these complexes exist as isomers.
Abstract: The coordination chemistry of iron covers a wide field, as shown by a survey covering the crystallographic and structural data of almost one thousand and three hundred coordination complexes. About 6.7% of these complexes exist as isomers and are summarized in this review. Included are distortion (96.6%) and cis — trans (3.4%) isomers. These are discussed in terms of the coordination about the iron atom, bond length and interbond angles. Distortion isomers, differing only by degree of distortion in Fe-L, Fe-L-Fe and L-Fe-L parameters, are the most common. Iron is found in the oxidation states zero, +2 and +3 of which +3 is most common. The stereochemistry around iron centers are tetrahedral, five — coordinated (mostly trigonal — bipyramid) and six — coordinated. The most common ligands have O and N donor sites.
2 citations
TL;DR: The coordination chemistry of germanium covers quite bulk fields, as shown by a survey covering the crystal- lographic and structural data of over two hundred examples as mentioned in this paper, and about ten percent of those complexes exist as distortion iso- mers.
Abstract: The coordination chemistry of germanium covers quite bulk fields, as shown by a survey covering the crystal- lographic and structural data of over two hundred examples. About ten percent of those complexes exist as distortion iso- mers and are summarised. These are discussed in terms of the coordination around the germanium(I), germanium(II) and germanium(IV) atoms, and correlations are drawn between donor atoms, bond distances and interbond angles. Distortion isomers differing only by degree of distortion in Ge - L and L - Ge - L angles by far prevail. There is an example, which contains within one crystal distortion and coordination isomers, which is rarity.