Syntheses, Crystal Structures and Luminescent Properties of Dinuclear d10 Complexes Based on a Ligand Formed in Situ by 8-Hydroxyquinoline

Three novel d(10) complexes [M-2(HL)(3)] NO3 center dot H2O (M=Cd (1), Zn (2, 3), H2L=7,7'-(ethane-1,1-diyl)diquinolin-8-ol) have been synthesized under solvothermal conditions. Single crystal X-ray diffraction analysis reveals that the complexes have the same coordination positive charged unit, [M-2(HL)(3)](+), but different lattice structures due to the different places of the guest molecules. Complexes 1 and 3 crystallize in hexagonal system (P6(3)/m) and complex 2 crystallizes in trigonal system (R<(3))over bar>. The metal ions are six-coordinated with three oxygen atoms and three nitrogen atoms of three HL ligands, presenting a slightly distorted octahedron geometry. There are abundant weak interactions between HL- ligands and guest molecule (NO3- and H2O), which play a vital role in the form of the crystal packing. These complexes show good thermal stabilities and exhibit green fluorescence. Further, the fluorescence of ligand H2L extracted from the complex 1 has also been studied firstly and blue light emission of it was observed. CCDC: 1842916, 1; 1842917, 2; 1842918, 3.