Synthesis, structures and luminescence properties of three manganese coordination polymers with bis(1,2,4-triazol-1-ylmethyl)benzene

One-dimensional chain manganese coordination polymers [Mn(mbtz)2(dca)2(H2O)]n (1), [Mn(mbtz)2Cl2]n (2) and [Mn(mbtz)2(NCS)2]n (3) (mbtz = 1,3-bis(1,2,4-triazol-1-ylmethyl)benzene, dca = dicyanamide) have been synthesized and characterized. X-ray crystal structure shows that there are two kinds of mbtz ligands in 1. One acts as the bridging (bidentate) coordination mode and shows the anti-conformation. The other shows the terminal (monodentate) coordination mode and exhibits the syn-conformation. The bridging mbtz ligands link the Mn(II) atoms to form the one-dimensional helical chain in 1, 2 and 3 are similar one-dimensional chain containing the double bridges of mbtz ligands. 1, 2 and 3 exhibit blue luminescent emissions maximum at 385, 405 and 414 nm, respectively, in the solid state at room temperature.