Sonochemical synthesis and characterization of four nanostructural nickel coordination polymers and photocatalytic degradation of methylene blue

Lin-Lu Qian^a, Vladislav A. Blatov^{b, c}, Zhi-Xiang Wang^a, Jian-Gang Ding^a, Li-Ming Zhu^a, Ke Lia,Bao-Long Li^{a ,*} （李宝龙）, Bing Wu^a

^a State and Local Joint Engineering Laboratory for Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University,Suzhou 215123, PR China

^bSamara Center for Theoretical Materials Science (SCTMS), Samara State Technical University, Molodogvardeyskaya St. 244, Samara 443100, Russia

^c Samara Center for Theoretical Materials Science (SCTMS), Samara University, Ac. Pavlov St. 1, Samara 443011, Russia

Ultrasonics Sonochemistry 56 (2019) 213--228

Four nanostructural nickel(II) coordination polymers {[Ni(ttpa)(1,4-ndc)(H2O)2]·2H2O}n (1), {[Ni(ttpa)(1,3-bda)]·2H2O·DMF}n (2·2H2O·DMF), {[Ni(ttpa)(1,4-bdc)]·H2O}n (3) and {[Ni(ttpa)(aip)(H2O)]·3H2O}n (4·3H2O) were synthesized using hydrothermal and sonochemical methods (ttpa = tris(4-(1,2,4-triazol-1-yl)phenyl)amine, 1,4-ndc = 1,4-naphthalenedicarboxylate, 1,3-bda = 1,3-benzenediacetate, 1,4-bdc = 1,4-benzenedicarboxylate, aip = 5-aminoisophthalate), and characterized by elemental analysis, IR spectra, scanning electron microscopy, single-crystal and powder X-ray diffraction analysis, optical band gaps, VB XPS spectra and luminescence. The effects of sonication power, time and frequency on the size and morphology of nano-sized 1-4 have been studied. 1 exhibits an unusual 2D + 2D  3D inclined polycatenated motif based on the (3,3)-coordinated 63-hcb topology. 2 shows a (3,4)-coordinated 2D network of the bey topology. 3 presents a rare example of the 4-fold interpenetrating array of (3,5)-coordinated 3D network belonging to the 35T1 topology type. 4 displays an unusual 2D  3D polythreaded network based on 2D sql networks. 1-4 exhibit luminescent emissions at 409, 399, 413 and 402 nm, respectively. 1-4 are semiconducting in nature, with Eg of 2.12 eV (1), 2.34 eV (2), 2.32 eV (3), and 2.47 eV (4). 1-4 are good catalysts for the degradation of MB under visible light irradiation. The effects of the size and morphology of nano-sized 1-4 on the photocatalytic efficiencies were studied. The higher sonication frequency obtains uniform and smaller nano-sized coordination polymers which have higher catalytic efficiencies.

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