Six New Complexes Based on Substituted Pyridazine Ligands: Structures and Luminescent Properties

Abstract

Three structurally related ligands 3-chloro-6-(benzoimidazol-1-yl)pyridazine (L 1 ), 3-chloro-6-(1,2,4-triazol-1-yl)pyridazine (L 2 ) and 3,6-bis(imidazol-1-yl)pyridazine (L 3 ) were designed and synthesized, and six new Zn(II), Co(II), Cu(II) and Cd(II) complexes, namely, [M(L 1 )2Cl2] [M = Zn (1) and Co (2)], [Cu(L 2 )2(NO3)2(H2O)] (3), [Cu(L 2 )2Cl2]∞ (4), [CuL 3 (CH3COO)2]∞ (5) and [CdL 3 (SCN)2]∞ (6) were synthesized and characterized by elemental analyses, IR spectra as well as single-crystal X-ray diffraction analysis. The analysis reveals that complexes 1, 2 and 3 have a mononuclear structure, 1 and 2 have a similar structure. Complex 3 features a 1D structure with intermolecular O–H⋯O hydrogen bonding interactions. Complex 4 shows a 1D chain structure with bridging Clˉ ions. Complex 5 exhibits a 1D ladder structure. The 2D framework of 6 features are rectangular grid with a (4, 4) topology. Additionally, photoluminescence properties of ligands L 1 , L 3 and complexes 1, 2 and 6 have been studied and discussed. Six new metal-organic complexes were synthesized and structurally characterized, complexes 1, 2 and 3 have a mononuclear structure, complexes 4 and 5 show 1D chain structure, the 2D framework of 6 has a rectangle grid with a (4, 4) topology, moreover, photoluminescence properties of ligands L 1 , L 3 and complexes 1, 2 and 6 have been studied and discussed.