Syntheses, crystal structures and photoluminescence of two Cd(II) coordination polymers derived from a flexible bipyridyl ligand

A flexible bipyridyl ligand 2,2-bis(3-pyridylmethyleneoxy)-1,1'-biphenylene (3,3'-bpp) was prepared for the construction of coordination frameworks. Two cadmium(II) coordination polymers, [Cd(mu-3,3'-bpp)(2)Br-2](n) (1) and [Cd(mu-3,3'-bpp)(mu-SCN)(2)](n)(2) have been synthesized by the self-assembly between 3,3'-bpp and cadmium(II). 3,3'-bpp in 1 acts as a exo-bidentate ligand bridging CdBr2 unit to form a 1D double chains structure, while 3,3'-bpp and SCN- in 2 bridge Cd(II) centers resulting in a 1D zigzag chain structure. The solid-state fluorescent analyses show that complex 1 and 2 exhibit an intense broad emission band at 464 and 496 nm, respectively. (C) 2004 Elsevier B.V. All rights reserved.