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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：RSC ADVANCES

收录刊物：SCIE、EI

卷号：6

期号：94

页面范围：92092-92103

ISSN号：2046-2069

摘要：Four new organic-inorganic hybrid compounds based on the polyoxoanion [Co2Mo10H4O38](6-), namely [Zn-2(H2O)(5)(4,4'-bipy)(3)]H-2[Co2Mo10H4O38]center dot 5H(2)O 1, [Zn-2(H2O)(2)(bpe)(3)]H-2[Co2Mo10H4O38] 2, [Zn(H2O)(4)(H(2)bpp)(2)] [Co2Mo10H4O38]center dot 2H(2)O 3 and [Zn-3(Trz)(6)(H2O)(6)][Co2Mo10O38H6]center dot 12H(2)O 4 (4,4'-bipyridine = 4,4'-bipy, 1,2-bis(4-pyridyl)ethane = bpe, 1,3-di(4-pyridyl)propane = bpp, 1,2,4-triazole = Trz), have been synthesized and characterized by elemental analysis, IR spectroscopy, TG analysis, solid diffuse reflective spectroscopy, powder X-ray diffraction and single crystal X-ray diffraction. Crystal analysis reveals that compound 1 exhibits a 1D staggered ladder-like chain constructed from [Co2Mo10H4O38](6-) and zinc-4,4'-bipy complexes. Compound 2 shows a 1D zig-zag polymeric chain by the linkage of zinc-bpe complexes and [Co2Mo10H4O38](6-). In compound 3, [Co2Mo10H4O38](6-) units are linked by zinc ions to form a 1D inorganic chain, protonated H(2)bpp molecules can be connected together by directional hydrogen-bonding interactions to construct a 3D supramolecular framework. Compound 4 consists of linear trinuclear zinc units bridging six Trz ligands and a [Co2Mo10H4O38](6-) unit as the counter anion, extensive hydrogen bonds exist in the clusters forming a 3D supramolecular framework. Compounds 1-2 represent the first extended organic-inorganic hybrid structures based on Evans-Showell-type POMs. These compounds act as heterogeneous Lewis acid catalysts not only for the cyanosilylation of different carbonyl compounds with trimethylsilyl cyanide but also for recovery and reuse without displaying any significant loss of activity.