Synthesis, crystal structure, and magnetic properties of a phenoxo-bridged dinuclear nickel(II) complex

Abstract

A new dinuclear nickel complex, [(H_1.5L)₂](ClO₄) · 2CH₃OH · H₂O (1) (H₃L = 1,3-bis(salicylamino)-2-propanol), was synthesized and characterized by single-crystal X-ray diffraction, IR spectra, elemental analysis, and magnetic measurements. In contrast to commonly observed alcoholic oxygen bridges in previously reported dinuclear complexes, single-crystal X-ray studies reveal that the H₃L is highly distorted and links two Ni^II through the phenoxo oxygens of the ligands forming a [Ni₂O₂] core. The remarkable distortion of the ligand brings the two non-bridging phenol groups from different ligands close to share one hydrogen, keeping charge neutrality of the complex. Magnetic studies indicate that an overall antiferromagnetic interaction is operative between the metal centers.

Keywords:

• Dinickel(II) complex
• Crystal structure
• Magnetic properties
• Schiff base

Acknowledgments

We thank the National Natural Science Foundation of China (grants 20871113, 20921002, and 91022009) for the financial support.