Synthesis, crystal structures and magnetic properties of two new nickel(II) complexes with α-amino acid Schiff base

Abstract

Two nickel(II) complexes [Ni(napgly)(MeOH)] _n (1) and [Ni(napphe)(H₂O)₂(MeOH)] · H₂O (2), where the tridentate Schiff-base ligands H₂napgly and H₂napphe are condensed from 2-hydroxyl-1-naphthaldehyde with glycine and L-phenylalanine, respectively, were prepared and structurally characterized. In 1, two inversion-related Ni(II) ions were bridged by two O atoms from the phenolate groups of two napgly anions, forming a centrosymmetric dimeric unit which was further linked by carboxylate groups to give a two-dimensional network. Magnetic susceptibility studies performed on the complex revealed anti-ferromagnetic coupling between the metal centers. In 2, the crystal structures of the complex displayed a distorted octahedral coordination geometry in which the ONO-donor Schiff base was bonded to the metal. Intermolecular H-bonds linked the compound into a 2-D layer structure.

Keywords:

• Amino acid Schiff base
• Nickel(II) complex
• Crystal structure

Acknowledgements

We gratefully acknowledge the Teaching and Research Program for Outstanding Young Teachers in Higher Education Institutions of Ministry of Education, the Nature Science Foundation of Guangxi Province, the Education Department Foundation of Guangxi Province for the financial support of this work, and the Nature Science Foundation of Guangxi Normal University.