Construction of a series of Zn(II) and Cd(II) coordination polymers using a mixed-ligand approach: Structural analysis and photophysical properties

Abstract

A mixed ligand approach has been applied for the synthesis of a series of Zn(II) and Cd(II) coordination polymers, namely CP1 [{Zn(3-bpna)(bdc)}·CH3OH]α, CP2 [{Cd(3-bpna)(oba)}·DMF·H2O]α, CP3 [{Cd(3-bpna)(5-nipa)}·2DMF]α, CP4 [{Zn2(dpmndi)(oba)3}·4H2O]α, CP5 [{Zn(dpmndi)0.5(oba)·DMF}·DMF·H2O]α and CP6 [{Cd(dpmndi)(bdc)}·DMF]α, which are constructed by the reactions of the ligand 3-bpna or dpmndi and Zn(NO3)2·6H2O or Cd(NO3)2·4H2O in the presence of different dicarboxylate ligands, specifically terephthalic acid, 4,4′-oxydibenzoic acid and 5-nitroisophthalic acid, as a co-ligand under solvothermal conditions. These coordination polymers were structurally characterized and display 1D, 2D and 3D network structures. Moreover, their fluorescent behavior was also investigated and the results are found to be very promising.