Eight Zn(ii) and Cd(ii) complexes based on the aromatic C-centered triangular multicarboxylate and N-donor mixed ligands

Abstract

Eight new Zn(II) and Cd(II) complexes based on the aromatic multicarboxylate and N-donor mixed ligands, namely Zn₂(TCOPM)(2,2′-bipy)(OH)·1.25DMF (TCOPM = tris(p-carboxyphenyl)methane; 2,2′-bipy = 2,2′-bipyridine; DMF = N,N′-dimethylformamide) (1), Zn₂(α_OH-TCOPM)(phen)(OH)·DMF (α_OH-TCOPM = tris(p-carboxyphenyl)methanol; phen = 1,10-phenanthroline) (2), Zn₂(α_OH-TCOPM)(tpy)(OH)(H₂O) (tpy = 2,2′:6′,2′′-terpyridine) (3), Zn₃(α_OH-TCOPM)₂(dpe)·2H₂O (dpe = 4,4′-vinylenedipyridine) (4), Cd₃(TCOPM)₂(DMF)₂(H₂O)₂ (5), Cd₃(TCOPM)₂(4,4′-bipy) (6), Cd₃(TCOPM)₂(dpe) (7), and Cd₃(α_OH-TCOPM)₂(2,2′-bipy)₂·2DMF (8) were synthesized through a solvothermal reaction. The α_OH-TCOPM ligand is generated in situ by the nucleophilic addition of the TCOPM ligand. X-ray crystallographic analysis reveals that complexes 1–3, 5, and 8 exhibit a two-dimensional (2D) layered structure, while 4, 6, and 7 possess a 3D open framework. The coordination mode of TCOPM and the type of N-donors ligands have obvious effects on the final structures. The luminescence properties in the solid state of 1–4, 7, and 8 were also investigated.