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Showing papers by "Milan Melnik published in 1995"


Journal ArticleDOI
TL;DR: The bonding properties of thiocyanate groups of over one hundred copper species, studied by X-ray analysis, were analyzed in this paper, where it was shown that the bonding properties depend on the size of the positive charge on the copper atom.

112 citations



Journal ArticleDOI
TL;DR: In this article, the preparation, identification and especially the thermal properties of four hitherto noncharacterized compounds of this group of general formula (CH3CH2COO)2Zn·2L·H2O are described.
Abstract: Zinc carboxylates complexed with N-donor ligands have potential antifungal effects. The preparation, identification and especially the thermal properties of four hitherto non-characterized compounds of this group of general formula (CH3CH2COO)2Zn·2L·H2O are described in this paper. The experimental results are confronted with present knowledge on analogous compounds.

48 citations


Journal ArticleDOI
TL;DR: Zinc has a relatively low abundance in nature (10−6 of the earth's crust) but the chemistry of zinc compounds has been extensively investigated, and the relation-ships between structure and biomedical activity are of major importance as mentioned in this paper.
Abstract: Zinc has a relatively low abundance in nature (10−6 of the earth's crust) but the chemistry of zinc compounds has been extensively investigated, and the relation-ships between structure and biomedical activity are of major importance. Zinc appears to bc one of the more biologically important metals,1 second only to iron among the heavy metals (i.e. excluding sodium, potassium, magnesium and calcium).

47 citations


Journal ArticleDOI
TL;DR: In this article, the authors propose a new set of rules: 1.0, 2.0 and 3.0.ABBREVIATIONS 148] and 1.1.
Abstract: 0. ABBREVIATIONS 148

27 citations


Journal ArticleDOI
TL;DR: In this article, a review summarizes the data for almost six hundred silver coordination and organometallic compounds, with the silver atom occurring in oxidation states of +1, +2, and two examples of +3 in a square-planar environment.
Abstract: This review summarizes the data for almost six hundred silver coordination and organometallic compounds, with the silver atom occurring in oxidation states of +1, +2, and two examples of +3 in a square-planar environment. The +2 oxidation state is found in digonal, square-planar, tetrahedral and hexa-coordinated environments. The +1 oxidation state is by far the most common in various geometries from two to seven. The nuclearity range from mono- to polynuclear utilizing a variety of ligand types. There are several examples of distortion isomerism, and a few examples of polymerization isomerism. Correlations between bond lengths, bond angles, ligating atom radius and silver oxidation state are discussed.

26 citations


Journal ArticleDOI
TL;DR: In this article, the structure of organozinc compounds determined by X-diffraction has been reviewed and the relationship between structural parameters, covalent radii of coordinated atoms and the geometry of the coordination sphere are discussed.

23 citations


Journal ArticleDOI
TL;DR: In this article, the structural determination of over six hundred complexes of cadmium has been performed and the most common donor atoms in the higher coordination number complexes are Ν, Ο and CI.
Abstract: Cadmium chemistry is an important area of research from both an industrial and environmental point of view. This review surveys the structural determination of over six hundred complexes of cadmium. The coordination numbers observed range from two to eight with six occuring most frequently, and lower values mostly associated with carbon donor ligands. The most common donor atoms in the higher coordination number complexes are Ν, Ο and CI. A range of derivatives from dimers to polymers contain two or more cadmium atoms, however, there appears to be no evidence to suggest the existence of a direct Cd-Cd metal bond.

23 citations


Journal ArticleDOI
TL;DR: Two bidentate-bridging propionate ligands connect two Zn II atoms forming a dimeric [Zn 2 (C 3 H 5 O 2 ) 4 (C 6 H 6 N 2 O) 4 ] complex as mentioned in this paper.
Abstract: Two bidentate-bridging propionate ligands connect two Zn II atoms [Zn-O(3) 2.040(8) and Zn― O(4)(-x, -y, -z) 2.059(4)A] forming a dimeric [Zn 2 (C 3 H 5 O 2 ) 4 (C 6 H 6 N 2 O) 4 ] complex. The coordination around each Zn II atom is trigonal bipyramidal. A monodentate propionate anion completes the trigonal basal plane [Zn―O(1) 2.072 (3) A] and two unidentate nicotinamide ligands occupy the apical positions [Zn―N(11) 2.192(5) and Zn―N(21) 2.174 (4) A] of the coordination sphere of each Zn II atom. The Zn...Zn distance is 3.900(1)A.

6 citations




Journal ArticleDOI
TL;DR: The most common geometry found around zinc is tetrahedral, followed by binuclear and somewhat fewer tetraand hexanuclear examples as discussed by the authors, where the trinuclear and polynuclear are most common.
Abstract: This review covers the heterometallic complexes of zinc, and complements two previous reviews on the inorganic and organic complexes, respectively. There are nearly fifty of these heterometallic derivatives in which the heterometal atoms include both transition and non-transition metals, both hard (class A) and soft (class B). The most common geometry found around zinc is tetrahedral. The trinuclear and polynuclear are most common, followed by binuclear and somewhat fewer tetraand hexanuclear examples. The compounds include both organic and coordination complexation around the zinc and heterometal atoms.

Journal ArticleDOI
TL;DR: A review of germanium coordination and organometallic derivatives can be found in this paper, where the most common donor atom is carbon (methyl and phenyl) so the majority of the derivatives are organometallics.
Abstract: ABSTRACT Almost two hundred and fifty heterometallic germanium coordination and organometallic derivatives have been included in this review. There are some forty metals, up to fifteen metal atoms per cluster unit, found with germanium in complexes and clusters. The nuclearities are mostly from bito tridecameric, with examples of pentadecamers and polymers. The most common donor atom is carbon (methyl and phenyl) so the majority of the derivatives are organometallics. The non-transition heterometallic compounds are mostly colourless or yellow (Li, K, Cs, Mg, Ca, Sr, Ba, Sn and Pb). Those with transition metal elements range from yellow to red, with colours deepening through brown to black. Summaries of metal-metal distances are given in each section, and correlations are drawn between structural parameters


Journal ArticleDOI
TL;DR: The most common halogen associated with these Grignard structures is bromine as mentioned in this paper, and the carbon donor ligands are uni-, bi- or pentadentate.
Abstract: Structures of Grignard reagents determined by X-ray diffraction, as of the end of August 1992, have been reviewed. There are two preparative procedures reported for the 24 structures, which include monomers, dimers and oligomers. The hard Mg(II) atom is found in a tetra-, penta- and hexacoordinate environment with ligands ranging from soft, through borderline to hard. The most common halogen associated with these Grignard structures is bromine. The carbon donor ligands are uni-, bi- or pentadentate. Relationships between structural parameters, covalent radii of coordinated atoms and the geometry of the coordination sphere are discussed.