Synthesis, crystal structures and characterization of three cadmium(II) metal-organic coordination complexes constructed from flexible bis(imidazole) and carboxybenzaldehyde ligands

摘要

Three new cadmium(II) coordination complexes, namely, [Cd_2(1,2-bix)_4(L)_4]_n (1), [Cd(1,3-bix)(L)_2]_n.H_2O (2), [Cd(1,4-bix)(L)_2H_2O)]_n.2.5H_2O (3) have been synthesized using 4-carboxybenzaldehyde (HL) and 1,n-bis(imidazol-l-ylmethyl)benzene (1,n-bix; n = 2, 3, 4) as ligands. These complexes were structurally characterized by single-crystal X-ray crystallography and further characterized by FT-IR spectroscopy and thermogravimetric analysis (TGA). Complex 1 is a binuclear, complex 2 possesses a 1D double chain. Compound 3 features a 1D zigzag chain, assembled into a 2D layer structure by weak π-π interactions. The photoluminescent properties of the compounds 1-3 were also investigated.