Synthesis and spectroscopic characterisation of cobalt(II),nickel(II) and copper(II) complexes with 5-methyl-1-(2′-pyridyl)pyrazole-3-carbohydrazide

Abstract

The chelating behaviour of the title pro-ligand, 1 (MPyPzCH), is demonstrated by preparation of a range of its distorted-octahedral Co^II, Ni^II and Cu^II complexes with various counter ions, X (X = Cl, Br, NO₃, SCN, BF₄, or ClO₄). The neutral, tetradentate ligand appears to bind through the pyrazolyl 2_N and pyridyl 1′_N, amidic oxygen (ketonic form) and the terminal N of the hydrazide residue, respectively. The anions (X) in all cases are coordinated. The ESR spectra of some of the Cu^II complexes indicate dx²–y² as ground state.

Keywords

spectroscopy electrochemistry pyridyl-pyrazole carbohydrazide tetradentate cobalt(II)nickel(II)copper(II)

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