1-Picolyl-3-propylbenzimidazolium bromide （LBr） was prepared from benzimida- zole by alkylation with 2-chloromethyl-pyridine in the presence of NaH, followed by quaternization with 1-bromopropane. Ligand LBr was treated with AgBr in CH2Cl2 to afford a dinuclear silver（I） complex L2Ag2Br4 （1）. In complex 1, a 2-D supramolecular layer is formed through two types of π-π stacking interactions. Fluorescent emission spectra of ligand LBr and complex 1 are described.
1-Butylbenzimidazole L reacted with Cd（NO3）2·4H2O to afford complex [CdL（NO3）3H2O]·[HL] 1. The heptacoordinated Cd（Ⅱ） center adopts a distorted pentagongal bipyramidal geometry, and complex [CdL（NO3）3H2O]-entity and the protonated benzimidazium salt [HL]＋ are connected via N–H···O hydrogen bond to form a dimeric unit [CdL（NO3）3H2O]·[HL]. A 3-D supramolecular network of 1 is formed through N–H···O and O–H···O hydrogen bonds together with π-π stacking interactions. Reaction of L with CuCl2 afforded a mononuclear complex, [CuL2Cl2] 2, in which the tetracoordinated Cu（II） center adopts a distorted tetrahedral geometry. In contrast, 2-D supramolecular layers of 2 are formed by C–H···Cl hydrogen bonds. The fluorescent emission spectra of L, 1 and 2 are described.
A new cobalt（Ⅱ） polymer with quasi-rectangular cavities, [Co（L）2（TP）·H2O]n 1 （L=1-butylbenzimidazole, TP = terephthalate ion） has been prepared by means of self-assembly of 1-butylbenzimidazole, terephthalic acid and Co（NO3）2·6H2O. The structure of 1 was characterized by X-ray diffraction analysis. In the crystal packing, 2-D supramolecular layers are formed via π-π stacking interactions. The fluorescence emission spectra of L and 1 are described.
WANG Jian-HuaZHENG Zhan-YingWU Xiu-MeiWANG Xiu-GuangGUO Jian-HuaLIU Qing-Xiang
