Add time:07/12/2019 Source:sciencedirect.com
New coordination compounds of copper(II) chloride with 2-(N-acetylamino)-6-methylpyridine (L) of the compositions [Cu2L2Cl4] (1), [CuL(H2O)Cl2]·L (1a), and [CuL2Cl][CuLCl3]·C2H5OH (2) have been prepared by the reactions between ethanol solutions of L and ethanol solutions of CuCl2·2H2O at different Cu:L ratios. The compounds have been characterized by a set of methods including elemental analysis, IR-spectroscopy, single-crystal X-ray diffraction analysis, and magnetic susceptibility measurements in the range 5–300 K (for 1). The crystal structures of 1 and 1a revealed distorted square-pyramidal geometry around Cu(II) centers, while in 2 both distorted square-pyramidal and trigonal–bipyramidal coordinations are present. L acts as a bidentate chelate ligand bound to the metal center through the pyridine N atom and the acetyl O atom. The results of the study demonstrate that the presence of 6-methyl substituent in L provides a high steric hindrance, precluding the formation of complexes with a distorted octahedral coordination of Cu(II).
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