Two new hexacoordinated coordination polymers of cadmium(II) containing bridging units only: Syntheses, structures and molecular properties

Journal of Chemical Sciences

HABIBAR CHOWDHURY2¹  BARINDRA KUMAR GHOSH1²  DIPU SUTRADHAR²  SUBHASIS ROY²  SUSHOVAN KONER² 

[1] Department of Chemistry, Kabi Nazrul College, Murarai, Birbhum, West Bengal, 731 219, India$$;Department of Chemistry, The University of Burdwan, Burdwan, West Bengal, 713 104, India$$

关键词: Cadmium(II);    coordination polymers;    benzidine;    thiocyanate;    X-ray structures;    luminescence.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

The syntheses, characterizations and structures of a neutral 2D coordination polymer [Cd(bnzd)(NCS)₂]n (1) and a polycationic 3D coordination polymer isolated as perchlorate salt [Cd(bnzd)₃]n(ClO₄)₂n (2) (bnzd = benzidine) are described. X-ray structural analyses reveal that each hexacoordinated cadmium(II) center in 1 adopts a distorted octahedral geometry with a CdN₄S₂ chromophore bound by two N atoms of two different bnzd units and two N and two S atoms of symmetric doubly bridged end-toend NCS− units extended in a 2D sheet. Six N atoms of six different bridged bnzd units are bonded to each cadmium(II) in 2 in a non-ended fashion affording a 3D network structure. In the crystalline state, each 2D sheet structure in 1 is further stabilized by π· · ·π interaction which in turn affords a 3D network structure through multiple intermolecular N-H· · · S hydrogen bonds. On the other hand, the 3D network structure in 2 is stabilized by weak intermolecular N-H· · ·O hydrogen bonds and C-H· · ·π interactions. Bnzd, 1 and 2 display intraligand 1(π-π*) fluorescence in DMF solution at room temperature.

【 授权许可】

Unknown