Metal-organic coordination architectures of bis(N-imidazolyl) pyridazine: Syntheses, structures, emission and photocatalytic properties

Article abstract of DOI:10.1016/j.poly.2016.03.025

In efforts to explore the effects of metal ions, counter anions on the structures and properties of metal-organic complexes, seven new complexes [ZnL₄(OH)₂] (1), {[ZnL(AcO)₂](CH₃CH₂OH)}∞ (2), {[ZnL(H₂O)₄](SO₄)}∞ (3), [CdL₄(OH)₂] (4), {[CdL(AcO)₂](CH₃CH₂OH)}∞ (5), {[CdL(H₂O)₄](SiF₆)}∞ (6) and {[Cu₂L₂(SO₄)₂(H₂O)₂](H₂O)}∞ (7) [L = 3,6-bis(N-imidazolyl) pyridazine] were synthesized and structurally characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction. Complexes 1 and 4 have similar mononuclear structures. Complexes 2, 3 and 6 have 1-D chain structures, while 5 reveals 2-D neutral infinite sheet structure. One 1-D chain and one 2-D sheet form complicated structure of complex 7. The ligands L adopt didentate bridging mode to coordinate to the metal ions in complexes 2, 3, and 5-7. Obviously, the structural differences among them are attributable to the differences of metal ions, counter anions and coordination modes of ligand. The fluorescent property of complexes 1-6 have been investigated and discussed. In addition, complexes 1-5 exhibit photocatalytic activity and selectivity for dye degradation under UV light.