Syntheses, Structures and Luminescent Properties of Cd(Ⅱ)/Zn(Ⅱ) Coordination Polymers Based on the Flexible 4-Substituted Bis(1,2,4-triazole) Ligand

摘要

Two new cadmium(Ⅱ) and zinc(Ⅱ) coordination polymers,{[Cd(btre)0.5-(mip)(H2O)2]·H2O}n (1) and [Zn(btre)(mip)]n (2),were synthesized at room temperature condition and characterized by IR spectra,elemental analyses,single-crystal and powder X-ray diffractions (btre =1,2-bis(1,2,4-triazol-4-yl)ethane,H2mip =5-methyl-l,3-benzenedicarboxylic acid).Complex 1 belongs to the triclmic system,P() space group,with a =8.9830(6),b =10.0579(6),c =10.2479(9)(),a =98.837(6),β =115.975(8),γ =106.370(6)°,V =756.30(11) ()3 and Z =2;complex 2 crystallizes in monoclinic,space group P21/c,with a =7.0332(3),b =14.9947(7),c =15.9689(7) (),β =97.1170(10)°,V=1671.12(13) ()3 and Z =4.Compounds 1 and 2 based on the same N/O-donor ligands show different structures.The one-dimensional chains of 1 are further linked by hydrogen bonding and πr-π interactions to yield a three-dimensional supramolecular structure.The two-dimensional (6,3) networks of 2 are further extended into a 3D framework via π-π interactions.Thermal stabilities and luminescence of 1 and 2 were investigated.