Zheng-Ge Zhang, Zhen-Wen Wang, Yu Wang, Juan Chen, Yue-Lin Wang and Guo-Yu Yang
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引用次数: 0
Abstract
A Ni6-added polyoxometalate, (NH4)0.5Cs1.5K4Na3[Ni(H2O)6][{BO(OH)2}2Ni6(OH)(H2O)6(SiW10O37)2]·8H2O (1), was made with the guidance of the “lacunary-directing synthesis” strategy using a hydrothermal method and characterized by single crystal/powder X-ray diffraction, solid-state UV-vis spectroscopy, FT-IR spectroscopy, and thermogravimetric analysis. The polyoxoanion of 1 could be conceptually constructed by the synergistic directing effect of two dilacunary B-α-SiW10O37 fragments linked by a central [{BO(OH)2}2Ni6(OH)(H2O)6]9+ ({B2Ni6}) via Ni–O–W and Ni–O–Si linkages. The {B2Ni6} cluster was composed of a V-shaped {Ni6} core with an angle of 54.6° and further decorated with two BO(OH)2 groups. Furthermore, 1 could be applied in the Knoevenagel condensation reaction as a Lewis catalyst and exhibited excellent catalytic activity under mild reaction conditions.
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