Add time:08/29/2019         Source:sciencedirect.com

Hydrated Ni(II) chloride reacts with new substituted phenylazo-2,4-dinitrosoresorcinol ligands to give complexes with stoichiometry [NiClnL(H2O)](n = 0 or 1, and L is the anion of the ligand). These complexes have room-temperature μcff in the 1.77–2.66BM/Ni range. The planar ⇌ tetrahedral equilibrium for these complexes is proved by electronic spectral studies either in a Nujol mull or in a 1,2-dichloroethane solvent. The ligation properties of these complexes by the Lewis bases pyridine or 2-picoline point to the formation of a distorted octahedral configuration. The calculated ligand field parameters are related to the electronic characters of the ligands and the Lewis bases. The IR spectra show that all the titled ligands (except the o-carboxy compound) are monobasic bidentate, coordinated to the nickel ion via the enolized phenolic oxygen and the azo-nitrogen atoms. The o-carboxy compound acts as dibasic tridentate in the coordination.

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