ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Structurally novel bi-nuclear cobalt(III) complex self-assembled by a single-armed salamo-like ligand

Yang Zhang, Shi-Zhen Li, Yi-Bin Yan, Lin Dou, and Wen-Kui Dong

School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, People’s Republic of China

E-mail: dongwk@126.com

Received: 7 October 2022  Accepted: 31 May 2023

Abstract:

A structurally novel bi-nuclear Co(III) complex ([Co₂(L)₂(H₂O)₂]) was prepared by the reaction of a single-armed salamo-like ligand H₃L and Co(II) acetate tetrahydrates in methanol solution and characterized structurally. The crystallography data revealed that the Co(III) complex is bi-nuclear, and composed of two Co(III) atoms, two fully deprotonated ligand (L)³⁻ units and two coordinated H₂O molecules. This structurally novel Co(III) complex is different from the previously reported complexes derived from other similar single-armed salamo-like ligands. Each Co(III) atom partially occupies the N₂O₂ cavity of the ligand (L)³⁻ unit and the NO₃ cavity of another deprotonated ligand (L)³⁻ unit. Significantly, divalent Co(II) ions are oxidized to trivalent Co(III) ions upon coordination with the ligand (L)³⁻ units. Emission spectrum studies showed that the Co(III) complex is fluorescence quenched. Hirshfeld surfaces analyses revealed that H⋅⋅⋅H interaction contributes the most to the 2D fingerprinting map.

Graphical abstract

The bi-nuclear Co(III) single-armed salamo-like complex [Co₂(L)₂(H₂O)₂] has been successfully synthesized and structurally characterized. The fluorescence properties and Hirshfeld surfaces analyses of H₃L and its Co(III) complex were investigated.

Keywords: Single-armed salamo-like ligand; Co(III) complex; Supramolecular feature; Hirshfeld surface analysis; Fluorescence property

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02935-9

Chemical Papers 77 (10) 6255–6266 (2023)