A multifunctional Ni(ii) coordination polymer: synthesis, crystal structure and applications as a luminescent sensor, electrochemical probe, and photocatalyst. Issue 48 (24th November 2017) - Cui, Jing-Wang
Abstract : A new Ni(ii ) complex containing 2, 5-dichloroterephthalate and rigid bis(imidazole) ligands, which manifests multifunctional properties, has been synthesized and characterized. Abstract : Herein, a nickel coordination polymer (CP1 ), {Ni(1, 4-bib)1.5 (TPA-Cl2 )·H2 O} n (1, 4-bib = 1, 4-bis(1 H -imidazol-1-yl)benzene, H2 TPA-Cl2 = 2, 5-dichloro-terephthalic acid), has been synthesized under solvothermal conditions. The structure of CP1 is a 3D 3-fold interpenetrating framework with thesqc12 topology. The thermal stability and luminescence properties of CP1 were investigated. Scanning electron microscopy (SEM) images of this material display that it possesses an irregular block 3D structure. Interestingly, CP1 can serve as a multifunctional material via its luminescence sensing, electrochemical sensing, and photocatalytic properties. The experimental results indicate that CP1 is an efficient luminescent sensor for the detection of Fe 3+ ions in an aqueous solution. In addition, CP1 exhibits a sensitive and rapid electrochemical response to nitrite ions in water solution. The photocatalytic activities of CP1 were evaluated in the degradation of different dye contaminants (MB, RhB, and MO), and the results demonstrate that its photocatalytic efficiency for the degradation of MB is highest (92.1% for MB, 85.7% for RhB, and 86.2% for MO). The effects of different dyes, different powers of UV light, and different amounts of catalyst CP1 on the photocatalytic efficiency were also explored. Finally, the mechanism of the luminescence quenching effect toward Fe 3+ ions, electroreduction of nitrite ions, and photocatalytic degradation of different dyes have been investigated in detail.