A 2D Copper(Ⅱ) Complex with Half Paddlewheel-like Building Block Controlled by 1,2,4,5-Benzenetetracarboxylic Acid: Synthesis,Crystal Structure and Luminescence Property

摘要

Self-assembly reaction of 1,2,4,5-benzenetetracarboxylic acid (H4btc) with CuCl2 in mixed N,N-dimethylformamide (DMF),methanol and aqueous solution at room temperature generated a 2D complex,[Cu(btc)0.5(DMF)(H2O)]n (1) which was further characterized by X-ray diffraction,IR spectrum,elemental analysis and TG-DTA experiments.The structure determination reveals that the fundamental unit of complex 1 contains one Cu(Ⅱ) ion,half a btc4-,one DMF molecule and one water molecule,forming a half paddlewheel-like building block [Cu2(btc)(DMF)2(H2O)2] which is different from those previous Cu-btc(Ⅱ) polymers obtained either in water or other media without water.It crystallizes in monoclinic system,space group C2/c with a =22.8209(14),b =9.2244(6),c =10.8876(7) (A),β =117.5210(10)°,V =2032.6(2) (A)3,Z =2,CsH10CuNO6,Mr =279.71,Dc=1.828 g/cm3,μ =2.162 mm-1,F(000) =1136,the final R =0.0225 and wR =0.0652 with I ＞ 2σ(I).Furthermore,the thermal stability of complex 1 is observed to be dependent on the polymeric structure nature.And the luminescent measurements show that complex 1 produces strong emission at room temperature.