Abstract
Two binuclear coordination compounds of Cu(II) chloride with the bitopic ligand 1,1,2,2-tetrakis(pyrazol-1-yl)ethane (Pz4) of the composition [Cu2(µ2Pz4)(DMSO)2Cl4]·4H2O and [Cu2(µ2Pz4)(DMSO)2Cl4]∙2DMSO were prepared and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, single-crystal X-ray diffraction, and powder diffraction analysis. It was shown that in contrast to silver(I) and copper(II) nitrates, copper(II) chloride forms discrete complexes instead of coordination polymers. The supramolecular structure of the complex [Cu2(µ2Pz4)(DMSO)2Cl4]·4H2O with lattice water molecules is formed by OH···Cl and OH···O hydrogen bonds. Density functional theory (DFT) calculations of vibrational frequencies of the ligand and its copper(II) complex allowed for assigning IR bands to specific vibrations.
Highlights
Multitopic ligands are a class of ligands that nowadays have attracted an increasing amount of interest in many applications of coordination chemistry
Bitopic bis- and tris(pyrazol-1yl)methanes have served as ligands for the preparation of various silver coordination polymers of different topologies [20,21,22,23,24,25,26,27,28]
We focused on the synthesis and crystal structure peculiarities of Cu(II) coordination compounds containing the Pz4 ligand
Summary
Multitopic ligands are a class of ligands that nowadays have attracted an increasing amount of interest in many applications of coordination chemistry These ligands contain two or more separated metal-binding sites that allow them to form a wide variety of structures [1,2,3]. We synthesized silver coordination polymers containing the bitopic ligand 1,1,2,2-tetra(pyrazol-1-yl)ethane (Pz4 ) and showed that silver-based compounds are more likely to form polymeric rather than discrete structures [29]. We focused on the synthesis and crystal structure peculiarities of Cu(II) coordination compounds containing the Pz4 ligand. We report the first X-ray crystal structures of the pure ligand and two new copper(II) coordination compounds and discuss their peculiarities
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