Abstract
Three cobalt coordination polymers, namely {[Co(4-pmntd)2(CF3SO3)(H2O)]·(CF3SO3)·(C2H5OH)·0.5(HCCl3)·H2O} n (1), {[Co(4-pmntd)(H2O)4]·(NO3)2·H2O} n (2), and {[Co(4-pmntd)(pta)(CH3OH)2]·2(CHCl3)} n (3) (4-pmntd = N,N′-bis(4-pyridylmethyl)-naphthalene diimide; pta = terephthalate), have been synthesized by reactions of 4-pmntd with Co(CF3SO3)2·4H2O, Co(NO3)2·6H2O, and Co(pta), respectively. The complexes have been characterized by elemental analyses, powder X-ray diffraction, thermogravimetric analyses, IR spectroscopy, and single-crystal X-ray diffraction. In complex 1, the ligand adopts U-mode, resulting in a dumbbell-like 2D (4, 4)-sql net structure in a non-interpenetrating edge-to-edge arrangement. The Z-mode ligand arrangement leads to 1D zigzag chains for complex 2, and a 2D twofold interpenetrating bat-like (4, 4)-sql net for complex 3. A solution of complex 2 in DMF showed a change in color and remarkably enhanced fluorescence upon the addition of two equivalents of acetate, whereas other anions did not induce a color change. Hence, complex 2 can act as a highly promising acetate-detecting reagent. Their thermal and the gas adsorption properties of complexes 1 and 3 were investigated.
Graphical Abstract
Three 1D and 2D cobalt coordination polymers have been synthesized; their structural diversity in these complexes is attributed to different coordination abilities, geometries of counter-anions, and the different conformations adopted by the ligand. A solution of complex 2 showed a change in color and remarkably enhanced fluorescence upon the addition of two equivalents of acetate, whereas other anions did not induce a color change. Hence complex 2 can act as a highly promising acetate-detecting reagent. Their thermal properties and the gas adsorption property of complexes 1, 3 were investigated.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 21403191), the Natural Science Foundation of Guangdong Province (No. 2014A030307010), Zhanjiang Science Technology Project (No. 2013B01054), and Lingnan Normal University Science Research Foundation (No. ZL1309).
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Li, GB., Liao, ZH., Pan, RK. et al. Synthesis, fluorescence, and sorption properties of cobalt coordination polymers of the N,N′-bis(4-pyridylmethyl)naphthalene diimide ligand. Transition Met Chem 40, 691–697 (2015). https://doi.org/10.1007/s11243-015-9963-9
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DOI: https://doi.org/10.1007/s11243-015-9963-9