Milan Melnik

Bio: Milan Melnik is an academic researcher from University of York. The author has contributed to research in topics: Copper & Crystal structure. The author has an hindex of 26, co-authored 219 publications receiving 2513 citations. Previous affiliations of Milan Melnik include York University & Slovak University of Technology in Bratislava.

Crystallographic and structural characterisation of heterometallic platinum compounds: Part I. Heterobinuclear Pt compounds

Abstract: This review covers almost 290 heterobinuclear Pt derivatives. When the heterometals (M) are non transition and the binuclear are found both with and without a metal to metal bond. Where M is a transition metal or actinide, only those with a metal-metal bond have been included here. There are thirteen non-transition metals (Sn, Hg, Ge, Sb, Tl, Zn, Pb, Cd, Na, K, Ga, Ca and In). The shortest Pt-M bond distance is 235.2(1) (Pt-Ge). There are eighteen transition metals (Fe, W, Rh, Re, Pd, Ag, Ir, Mo, Mn, Re, Co, Cu, Cr, Au, Ni, Ti, Ta and V). The shortest Pt-M bond distance is 249.5(2) pm (Pt-Cr). There is one example of an actinide, Pt-Th at 298.4(1) pm. The Pt atom has oxidation numbers 0, +2 and +4. The Pt coordination geometries include square planar (most common), trigonal bipyramidal, pseudo octahedral (Pt(IV)) and a few prevalently capped trigonal prismatic seven coordinate species. There are at least two types of isomerism distortion and polymerisation. Factors affecting bond lengths and angles are discussed and some ambiguities in coordination polyhedra are outlined. Open image in new window

Structural and spectroscopic characterization of copper(II) tolfenamate complexes

Abstract: The synthesis and characterization of four new solid complexes, Cu(tolf)2L2 (tolf = tolfenamate, L = 2-pyridylmethanol (2-pyme), 3-pyridylmethanol (3-pyme), nicotinamide (na)) and Cu(tolf)2(dena)2(H2O)2 (dena = N,N-diethylnicotinamide) is reported. The composition and stereochemistry as well as the mode for ligand coordination have been determined by elemental analysis, IR, electronic and EPR spectra. The carboxyl group of the tolfenamate anion coordinates to the Cu(II) atom as an unidentate or as a chelating ligand. The EPR spectra of the powdered solids are consistent with spin S = ½. The crystal structure of Cu(tolf)2(dena)2(H2O)2 has been determined at 293 K. The Cu(II) atom has a tetragonal–bipyramidal arrangement (CuO4N2). The spectroscopic data indicate that each copper(II) atom in Cu(tolf)2L2 has a tetragonal–bipyramidal environment built up by bidentate unsymmetrically coordinate tolfenamates and unidentate N-donor atom ligands.

Copper(II) clofibriates, Part II. A two-dimensional coordination polymer of Cu(clofibriate)2(3-pyridylmethanol)2

Abstract: A two-dimensional coordination polymer of [Cu(clof)2(3-pymeth)2]n1 (clof = clofibriate anion and 3-pymeth = 3-pyridylmethanol) has been synthesized and characterized by single crystal structural analysis. The coordination environment about the copper(II) atom is tetragonal bipyramidal. The compound crystallizes in the monoclinic system, space group P21/c with a = 15.206(3), b = 8.029(2), c = 14.338(3) A, β = 113.64(3)°, V = 1603.6(6) A3 and Z = 2.

Manganese Coordination Compounds: Classification and Analysis of Crystallographic and Structural Data

Abstract: This review summarises over seven hundred ciystallographic structures of manganese coordination compounds. In most the manganese is six coordinated, but there are examples from two to eight coordinated. The nuclearity ranges from monomelic to polymeric, and a wide range of ligand systems are found, which parallels the rich chemistry of manganese. The structures are discussed in terms of the coordination about the metal atoms, and correlations are drawn between donor atom, bond length and inteibond angles. There are several examples of distortion isomerism and CONTENTS 0. Abbreviations

Shape‐Controlled Synthesis of Metal Nanocrystals: Simple Chemistry Meets Complex Physics?

Abstract: Nanocrystals are fundamental to modern science and technology. Mastery over the shape of a nanocrystal enables control of its properties and enhancement of its usefulness for a given application. Our aim is to present a comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals. We begin with a brief introduction to nucleation and growth within the context of metal nanocrystal synthesis, followed by a discussion of the possible shapes that a metal nanocrystal might take under different conditions. We then focus on a variety of experimental parameters that have been explored to manipulate the nucleation and growth of metal nanocrystals in solution-phase syntheses in an effort to generate specific shapes. We then elaborate on these approaches by selecting examples in which there is already reasonable understanding for the observed shape control or at least the protocols have proven to be reproducible and controllable. Finally, we highlight a number of applications that have been enabled and/or enhanced by the shape-controlled synthesis of metal nanocrystals. We conclude this article with personal perspectives on the directions toward which future research in this field might take.