Variation of carboxylate binding mode in self-assembled Ni(II) complexes with tridentate reduced Schiff base ligand: Syntheses, structural analysis

Abstract

Two new Ni(II) complexes, [Ni₂L¹₂(C₆H₅CH₂COO)](ClO₄)·2CH₃CN (1) and [Ni₂L¹₂(C₆H₅CH₂COO)₂(H₂O)]·2H₂O (2) have been synthesized by using Ni(ClO₄)₂·6H₂O, a tridentate NNO donor reduced Schiff base ligand, HL¹ = [(3-dimethylamino-propylamino)-methyl]-phenol and phenylacetic acid as co-ligand. Both complexes have been characterized by single crystal X-ray crystallography, electronic and IR spectroscopy. Structural analysis reveals that Ni(II) ions possess distorted octahedral geometry in both complexes 1-2. Bis-µ₂-phenoxido bridged complex 1 has one syn-syn phenylacetate bridging, whereas complex 2 possesses similar type of structure with addition terminal coordination (Syn-monodentate-h¹ mode) by another phenylacetate molecule.