Syntheses, Crystal Structures and Fluorescence Properties of Cu(II)Zn(II)/Ag(I) Complexes with an Amide Type Ligand

Five complexes, [CuLCl2]center dot CH3COCH3 (1), [ZnLCl2]center dot CH3COCH3 (2), [ZnL(NO3)(2)]center dot 0.5CH(3)COCH(3) (3), [AgL2]ClO4 (4) and [AgL2]BF4 (5) (L=2-(5-chloroquinolin-8-yloxy)-1-(pyrrolidin-l-yBethanone), were synthesized and characterized by X-ray diffraction. Complexes 1 and 2 are isostructural, and in each of them the five coordinated metal ion is in a distorted tetragonal pyramid with a NO2 donor set from one ligand L and two chloride anions. However, the Zn (II) ion in complex 3 is coordinated with one tridentate ligand L, one monodentate and one bidentate nitrate anions, giving a distorted octahedral coordination geometry. The structures of 1-3 are quite similar as those of the acetonitrile solvates derived from the same ligand L and metal salts. By contrast, the ratio of the metal ion and ligand L is 1:2 in complexes 4 and 5, the central Ag(I) ion in each complex is six-coordinated with two independent ligands with N2O donor set, thus possesses a distorted octahedral coordination geometry. In CH3CN solution, the emission spectra of complexes 1, 3, 4 and 5 exhibit similar peak at 410 nm as the ligand L. However, the emission band of complex 3 red-shifts to 430 nm because of energy transferring from the ligand L to the Zn(II) ion. CCDC: 1484068, 1; 1484069, 2; 1484070, 3; 1484071, 4; 1484072, 5.