Synthesis and characterized Co(II) and Cd(II) based coordination polymers and their photocatalytic activity against pollutant dyes

Two new coordination polymers (CPs) with formulas [Co2(OH)(bb)2.5(HCOO)3(H2O)]n (1), and [Cd4(bb)5(HCOO)8]n (2) (bb = 4,4-bis(imidazolyl) biphenyl), have been synthesized and characterized. In 1, Co1 and Co2 are bridged with & mu;2-formato-syn-syn mode (syn-syn bidentate bridging) and & mu;1-& eta;1-formato mode (mon-odentate bridging). In 2, Cd1 and Cd2 are bridged with & mu;2-formato-syn-syn mode (syn-syn bidentate bridging). CPs 1 and 2 are semiconducting nature. The photocatalytic degradation properties of the two CPs are investi-gated. Significantly, CP 2 is a good photocatalyst for the degradation of methyl blue (MB). Moreover, the possible photodegradation mechanism was proposed and explored. The active species involved in the degradation of MB has been assessed using trapping experiments.