Anion-dependent structural diversity in cadmium coordination polymers of flexible bis(1,2,4-triazol-1-yl)butane

The self-assembly reactions of the flexible ligand 1,4-bis(1,2,4-triazol-1-yl)butane (btb) and Cd(II) salts with different anions image, image, image, image give 1D chain [Cd(btb)(H2O)2(NO3)2]n (1), threefold interpenetrated diamondoid network {[Cd(btb)2(H2O)2](BF4)2}n (2), threefold interpenetrated α-polonium cubic network {[Cd(btb)3](ClO4)2}n (3) and {[Cd(btb)3](PF6)2}n (4). Compounds 1, 2, 3 and 4 exhibit blue luminescent emission maxima at 439, 426, 422 and 424 nm, respectively, in the solid state at room temperature. The frameworks of 2, 3, 4 maintain stable when 2, 3, 4 are kept at 240 °C at vacuum for 2 h.