Synthesis and Crystal Structure of Tetranuclear Nickel Complex Derived from a N-(3-Methoxy-2-hydroxybenzyl)glycine Ligand

Abstract

A tetranuclear nickel(II) complex featuring defective double-cubane of formula, [Ni₄(L)₂(C₁₂H₈N₂)₂(CH₃O)₂(H₂O)₂](ClO₄)₂ (1), where H₂L is N-(3-methoxy-2-hydroxybenzyl)glycine has been prepared and structurally characterized. The structure of complex 1 consists of one [Ni₄(L)₂(C₁₂H₈N₂)₂(CH₃O)₂(H₂O)₂]²⁺ cation and two perchlorate anions. The vertices of the two face-sharing defective cubanes are occupied by alternating nickel and oxygen ions and the four Ni(II) ions in the cluster are held together by two bridging μ₃-CH₃O^– ions and four μ₂-O^– ions from two L^2- ligands, forming a planar Ni₄ parallelogram. The complex 1 is further stabilized via intramolecular hydrogen bonds, generating a dimeric unit.