Abstract
Mixtures of three new MOFs, [Cu(Hdpt)(tdc)(H2O)]n (1), {[Cu2(Hdpt)2(tdc)2]·2DMF}n (2) and [Cu2(dpt)(tdc)]n (3) (H2tdc=thiophene-2,5-dicarboxylic acid, Hdpt=4,4′-(1H-1,2,4-triazole-3,5-diyl)bis-Pyridine), have been prepared by hydrothermal method and characterized by single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), IR, TGA, and EA. Through precisely modulating the reaction conditions, pure samples of the three MOFs could be separately obtained, and regularity of reaction conditions impacting the resulted product was founded as well. Interestingly, it reveals that under moderate temperature and high DMF/H2O ratio, 1 firstly crystalized very quickly, and gradually transformed to 3 as time grows, which could be eye-monitored and demonstrated by PXRD as well. Moreover, the gas adsorption properties have also been investigated, which show potential applications in gas storage and separation. This work may set an example for the controllable synthesis of MOFs in systems that easily afford mixed-crystals.
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