Syntheses, structures and luminescent properties of three cadmium coordination polymers with 1,3-bis(1,2,4-triazol-1-ylmethyl)benzene

Three cadmium(II) coordination polymers {[Cd(mbtz)2(H2O)2](BF4)2}n (1) [Cd(mbtz)2Cl2]n (2) and [Cd(mbtz)2Br2]n (3) (mbtz = 1,3-bis(1,2,4-triazol-1-ylmethyl)benzene) have been synthesized and characterized. In 1, 2 and 3, two mbtz ligands are wrapped around each other and are held together by cadmium(II) atoms to form one-dimensional chain. Two-dimensional hydrogen bonding network of 1 is formed via the hydrogen bonding interactions between the coordination water molecules and BF4- anions. 1, 2 and 3 exhibit blue luminescent emissions maximum at 465, 400 and 402 nm, respectively, in the solid state at room temperature.