SYNTHESIS, CRYSTAL AND MOLECULAR STRUCTURE OF 2-METHYLTHIOSEMICARBAZIDE COPPER(II) NITRATE, [CU(2METSC)(2)(NO3)(2)]

摘要

The copper(II) complex of 2-methylthiosemicarbazide (2MeTSC) was obtained to evaluate the influence of the N-2-substitution on the structure and properties of thiosemicarbazide complexes. The crystal and molecular structures of [Cu(2MeTSC)(2)(NO3)(2)] were determined by single crystal X-ray diffraction. The complex is monomeric hexa-coordinated with a strongly tetragonally elongated octahedral structure. Two 2MeTSC groups coordinate to the metal ion as bidentate ligands through the hydrazinic nitrogen and the sulphur atom, determining a nearly square planar coordination. The fifth and sixth positions are occupied by oxygen atoms from two NO; anions, at a long distance from the metal [Cu-O = 2.864(3) Angstrom A]. The Cu-S [2.262(1) Angstrom A] and Cu-N(3) [1.992(3) Angstrom A] bond lengths are shorter than those observed in similar thiosemicarbazide copper(II) compounds, indicating a stronger bond. Another point of interest is the association of the complex units into a three-dimensional network through hydrogen bonding (O2NO ... H-N). [References: 18]