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  • Author: Jaap Willems x
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Abstract

The preparation and characterization of 4,4′-bi-1,2,4-triazole is described. The compound is a strong, polydentate, polynucleating nitrogen donor. Two complexes, M(btr)2(NCS)2H2O M=Co, Ni, are described. The vibrational spectra of ligand and complexes are compared. A structure for the complexes is proposed.

Abstract

Coordination compounds of 4-ethyl-1,2,4-triazole (Ettrz) with Mn, Fe, Co, Ni, Cu and Zn are reported. The compounds have been identified and characterized by chemical analyses, infrared and ligand field spectra, electron paramagnetic resonance (e.p.r.) measurements, magnetic susceptibility measurements and thermoanalytical experiments. Except for the Cu compound, which is polynuclear, all compounds appear to be binuclear, with both bridging bidentate and non-bridging triazole ligands. The overall formula is M(Ettrz)2(NCS)2(H2O)3/2 for Mn, Fe, Co and Ni. The copper and zinc compounds have the formula Cu(Ettrz)2(NCS)2 and Zn(Ettrz)3/2(NCS)2.

Transition metal(II) fluoroborates and nitrates give various complexes with 1,2,4-triazole. Most of these complexes are expected to be polynuclear. The infrared and ligand field spectra have been used to predict some structural aspects of the compounds. The iron complex shows a low spin → high spin transition on heating.