Syntheses,Structures,and Properties Of Coordination Polymers Constructed By An Azamacrocycle-Based Tetracarboxylate

Four two dimensional coordination polymers,{[Zn₂（L）（biim-4）]·2H₂O}n （1）, {[Zn₂（L）（biim-4）]·2H₂O}n （2）, [Cd2（L）（biim-4）（DMF）2]n （3） and{[CO₂（L）（biim-4）]·3H₂O}n （4）, where H4L= 1,4,8,11-tetrazacyclotetradecane-N,N’,N",N’"-tetra-methylene-benzoic acid and biim-4=1,1’-（1,4-butanediyl）bis（imidazole）, have been synthesized under solvothermal conditions. In the structures, L anions and biim-4 ligands unite their respective metal ions to furnish layer with binuclear units. The layers are further connected by C-H…π interactions into three dimensional supramolecular architectures, respectively. The compounds were characterized by Infrared spectrum and powder x-ray diffraction patterns. The luminescent recognition properties of polymers 1-3 to metal cations, anions and small organic molecules have also been explored systematically. The results demonstrate that 1-3 display high sensitive and selective luminescent sensing towards Fe3+ ion, Cr2O72- anion and nitrobenzene. The variable-temperature magnetic susceptibility of polymer 4 was also investigated.