Halogen···π Interactions in Supramolecular Architecture of 1D Coordination Polymers and Their Electrical Conductance

摘要

Two isotypical Cd(II)based one-dimensional coordination polymers(1D CPs)[Cd2(p-clba)4(bpy)2]·(C2H5OH)(1)and [Cd2(pbrba)4(bpy)2]·(C2H5OH),(2)(H2p-clba=para-chlorobenzoic acid,H2p-brba=para-bromobenzoic acid and bpy=4,4’-bipyridine)have been synthesized and characterized by X-ray structure analysis.In the solid-state strcuture,both the compounds undergo X···п(X=Cl or Br)interactions to generate twodimensional(2D)supramolecular architectures.Here,due to the larger size and more polarisability of Br atom,Br···п interaction is stronger than Cl···п,which is accounted for the stronger interchain interactions in 2 as compared to 1.This is depicted in the observed electrical conductivity of the compounds.The compound 2 with stronger interchain interactions shows better charge transport and hence,increasing conductivity.Moreover,band gap of the CPs has been obtained by DFT computation,which also supports the progression of conductivity.