The investigation of two bis(phenoxo)-acetate-bridged binuclear nickel(II) complexes driven by different alcohol solvents

Abstract

Two solvent-induced bis(phenoxo)-acetate-bridged binuclear Ni(II) complexes, [Ni₂(L)(µ-OAc)(CH₃OH)] (1) and [Ni₂(L)(µ-OAc)(H₂O)] (2), were synthesized with a bis(salamo)-like ligand H₃L and Ni(OAc)₂·4H₂O in two different alcohol solvents (methanol and ethanol). Complexes 1 and 2 were described by elemental analyses, single crystal X-ray diffraction, IR spectra, UV–vis spectra and fluorescence spectra. Complexes 1 and 2 have analogous crystal structures, but the non-covalent interactions are distinct. The one-dimensional chain of 1 is formed by π–π interactions, and the three-dimensional supramolecular network structure of 2 is formed by intermolecular hydrogen bonding interactions. In addition, fluorescence experiments indicated that the fluorescence of 1 and 2 undergoe a significant quenching compared to H₃L. Intermolecular forces were investigated using Hirshfeld surface analysis. DFT calculations showed that 1 and 2 have high chemical reactivity and low kinetic stability.

Keywords:

• Bis(salamo)-like ligand
• Nickel(II) complex
• solvent effect
• fluorescence property
• theoretical calculation

Acknowledgements

This work was supported by the Science and Technology Program of Gansu Province (21YF5GA057), which is gratefully acknowledged.

Disclosure statement

The authors declare no competing financial interests.