Construction Of Superamolecular Structures Based Bis-imidazole And Carboxlate Acid And Studies Of Their Luminencence

The coordination polymers have received much attention currently not onlybecause of their structural diversities but also their potential applications as optical,adsorbent, and catalytic materials. In this thesis, we chose4,4′-bis(1-imidazolyl)bibenzene,2-chlor-4,4′-bis(1-imidazolyl)bibenzene,benzene-1,4-dicarboxylic acid,4,4′-biphenyldicarboxylic acid (H2bpdb),1,3,5-benzenetricarboxylic acid (H3btc),4-methyl--benzenecarboxylic acid (Hmbc) toreact with Cd(II), and afforded five supermolecular compounds1-5. We investigatetheir crystal structures and photoluminescent properties.1. A three-dimensional supramolecular coumpound [bimb·1,4-bdc]n(1) throughhydrogen bonding and π-π stacking interactions was attained by treatment of4,4’-twoimidazole biphenyl (bimb) and terephthalic acid (H2bdc)in hydrothermal condition andcharacterized by elemental analysis, IR spectra and single-crystal X-diffraction.Compound [(bimb)·(1,4-bdc)]ncrystallizes in the monoclinic space group P21/c, α=12.792(3), β=10.156(2), γ=19.968(6), V=2113.0(9)3，Z=2, R1=0.0634,wR2=0.1407. In coumpoud [(bimb)·(1,4-bdc)]n. each H2bdc and bimb are connectedvia hydrogen-bonding interactions O-H···N to form1D (H2bdc)2-bimb-(H2bdc)2chain,which are further linked to its adjacent chain by non-classical hydrogen-bondinginteractions give a2D net. A three-dimension super-molecular structure is finallyobtained by means of π-π stacking interactions.2. Solvothermal reactions of CdCl2·2.5H2O with bimb and Hmbc afforded onecoordination polymer [Cd(mbc)2(bimb)2]n(2), CdCl2·2.5H2O with cbimb and1,4-H2bdc afforded one coordination polymer [Cd(1,4-bdc)(cbimb)]n(3).2possesses1D chains which are connected through π-π stacking interaction to result in3Dsupermolecular structure, while3is a pillared-layer3D framework. Solvothermalreactions of CdCl2·2.5H2O with H2bpdb or H3btc afforded [Cd(bpdb)(H2O)]n(4) and[Cd(btc)(H2O)5]n(5).4displays3D archtecture, while3D H-bonded nets (5) based onholding2D layers through intermolecular H-bonding interactions.