Synthesis, Crystal Structure and I2 Capture of a Cd(Ⅱ) Coordination Polymer Based on a Linear Bipyridyl Benzene Ligand

摘要

A new complex with formula [Cd(3-pbpmb)2I2]n 1 (3-pbpmb =1,4-bis(pyridine-3-ylmethoxy)benzene),has been solvothermally synthesized and characterized.The crystal belongs to monoclinic system,space group P21 with a =8.2905(17),b =16.078(3),c =13.213(3) (A),β =99.44(3)°,Mr =950.86,V=1737.3(6) (A)3,Z =2,Dc =1.818 g/cm3,F(000) =924,μ =2.450 mm-1,the final R =0.0198 and wR =0.0467 for 3053 observed reflections (I ＞ 2σ(I)).The Cd(Ⅱ) ion is coordinated by four N atoms of four 3-pbpmb ligands and two iodine ions to furnish a distorted octahedral coordination geometry.The Cd(Ⅱ) ion and its own symmetry-related ions are bridged by N atoms from two 3-pbpmb ligands to generate a "zigzag" 1-D chain coordination polymer.These 1D chains are further connected into a three-dimensional (3D) framework by C-H...π interactions and intermolecular C-H…I hydrogen bond.Interestingly,1 displays efficient sorption of molecular iodine gas (up to 111 wt％),but invalid sorption of molecular water gas.