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

A structurally novel bi-nuclear Co(III) complex ([Co-2(L)(2)(H2O)(2)]) was prepared by the reaction of a single-armed salamolike 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 center dot center dot center dot H interaction contributes the most to the 2D fingerprinting map. [GRAPHICS] .

Automated summary

A structurally novel bi-nuclear Co(III) complex was prepared and characterized. The complex consists of two Co(III) atoms, two fully deprotonated ligand (L)(3-) units, and two coordinated -H2O molecules. The emission spectrum studies showed that the complex exhibits fluorescence quenching. Hirshfeld surfaces analyses revealed that H center dot center dot center dot H interaction contributes the most to the 2D fingerprinting map.