Synthesis, characterization and luminescent properties of polymeric cadmium(II) bridged-thiocyanato and mononuclear thiocyanato-zinc(II) complexes of pyridine-N-oxide derivatives.

The synthesis and structural characterization of six new d 10 Cd(II) and Zn(II) thiocyanato complexes with pyridine- N -oxide compounds: the polymeric catena -[Cd(μ 2 -2-picoline- N -oxide)(μ N,S -NCS) 2 ] ( 1 ), catena -[Cd(μ 2 -3-picoline- N -oxide)(μ N,S -NCS) 2 ] ( 2 ), catena -[Cd(4-nitropyridine- N -oxide) 2 (μ N,S -NCS) 2 ] ( 3 ), the dinuclear [Cd(4-cyanopyridine- N -oxide) 2 (μ N,S -NCS)(NCS)(H 2 O)] 2 ( 4 ) and the mononuclear complexes [Zn(2-picoline- N -oxide) 2 (NCS) 2 (H 2 O)] ( 5 ) and [Zn(4-cyanopyridine- N -oxide) 2 (NCS) 2 (H 2 O)] ( 6 ) are reported. Single crystal X-ray crystallography revealed the 2D polymeric nature in complexes 1 and 2 , the 1D chain in 3 and the dimeric structure in complex 4 with the doubly-bridged Cd(μ N,S -NCS) 2 Cd moiety. Five-coordinate monomeric Zn(II) complexes were obtained in 5 and 6 , where the thiocyanto ligands are acting as monodentate N-bonded. The emission spectral properties of the six complexes were investigated. Very strong enhancing fluorescence intensity was observed in complex 3 . [ABSTRACT FROM AUTHOR]