Effects of different factors on the formation of nanorods and nanosheets of silver(I) coordination polymer

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.

Photoluminescence, electrochemical behavior and photocatalytic activities of cobalt(II) coordination polymer nanostructures synthesized by sonochemical process

Nanostructures of a new Co(II) coordination polymer (CP), [Co(Hbibp)(nbta)]_n (1), (bibp=4,4'-bis(1-imidazolyl)biphenyl, H₃nbta=5-nitro-1,2,3-benzenetricarboxylic acid) was synthesized by a sonochemical method. The nano-sized CP 1 was characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction and scanning electron microscopy (SEM). Structural analysis show that CP 1 exhibits a 1D chain structure with a 3-connected SP 1-periodic net (4,4)(0,2) topology, which can be further extended into a 2D supramolecular layer by the NH⋯O hydrogen bond interactions. The thermal stability for CP 1 as bulk and nanoparticles were investigated. The photoluminescence properties and electrochemical behavior for nano-sized CP 1 have also been explored. Moreover, nano-sized CP 1 shows high photocatalytic activities for the degradation of MB under UV irradiation and the photodegradation process is mainly caused by OH radicals. Effects of the sonication time and ultrasonic power on the morphology and size of nanoparticles were studied.