Structures, luminescence and photocatalytic properties of two nanostructured cadmium(II) coordination polymers synthesized by sonochemical process.

By varying the dicarboxylate coligands, two nano-sized cadmium(II) coordination polymers (CPs), [Cd(bix)(DCTP)]n (1) and [Cd(bix)2(BPDC)]n (2) (bix=1,4-bis(imidazol-1-ylmethyl)benzene, H2DCTP=2,5-dichloroterephthalic acid, H2BPDC=biphenyl-4,4'-dicarboxylic acid) were synthesized hydrothermally and sonochemical irradiation. CPs 1-2 and their nanostructures have been characterized by elemental analysis, single-crystal X-ray diffraction, and scanning electron microscopy (SEM). CP 1 features a uninodal 4-connected 2D sql network consisting of two different helical arrays. Whilst, CP 2 displays 2D layer which constructed by the linear chains and M2L2 type discrete loops. The effect of ultrasonic power and temperature on the morphology and size of CPs 1-2 are investigated in detail. Nano-sized 1-2 show the relatively high photocatalytic performance for degradation of Methylene Blue (MB) under UV irradiation.