Oxidative coupling of 2-naphthol by zeolite-Y supported homo and heterometallic trinuclear acetate clusters

Das Sameeran Kr.; Mahanta Sanjeev P.; Bania Kusum K.

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Oxidative coupling of 2-naphthol by zeolite-Y supported homo and heterometallic trinuclear acetate clusters

机译：沸石-Y负载的均相和异金属三核醋酸盐簇对2-萘酚的氧化偶联

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Two trinuclear acetate clusters of iron and cobalt of general formula [Fe3O(O2CCH3)(6)(H2O)(3)]NO3 center dot 2H(2)O and Fe2Co(O)[(OOCC6H4NO2)(6)]NO3 center dot 2H(2)O are synthesized and characterized. The synthesized trinuclear clusters are supported on zeolite-Y via an ion exchanged method. FTIR study reveals that the two complexes are tethered via formation of Si-O-H center dot center dot center dot O-H hydrogen bond linkages with a zeolite-Y matrix. Homogeneous and heterogeneous trinuclear catalysts are found to be efficient catalysts for oxidative coupling of 2-naphthol. Compared to homometallic oxo-clusters, bimetallic complexes are found to show better catalytic activity. Besides obtaining BINOL as a major product, these metal clusters also lead to formation of the tautomeric form of BINOL. The crystal structure of the by-product indicates the formation of a tetrahedral chiral centre in the molecule via the attachment of the solvent. Density Functional Theory (DFT) calculations have been performed to elucidate the structural and electronic properties of both homogeneous and heterogeneous complexes.

机译：铁和钴的两个三核乙酸簇，通式为[Fe3O（O2CCH3）（6）（H2O）（3）] NO3中心点2H（2）O和Fe2Co（O）[（OOCC6H4NO2）（6）] NO3中心点合成并表征了2H（2）O。合成的三核团簇通过离子交换法负载在沸石Y上。 FTIR研究表明，这两种配合物是通过与沸石Y基体形成Si-O-H中心点中心点中心点O-H氢键连接而束缚的。发现均相和异相三核催化剂是2-萘酚氧化偶联的有效催化剂。与同金属氧簇相比，发现双金属配合物表现出更好的催化活性。这些金属簇除了获得主要的BINOL以外，还导致BINOL的互变异构形式的形成。副产物的晶体结构表明通过溶剂的附着在分子中形成了四面体手性中心。已经进行了密度泛函理论（DFT）计算，以阐明均质和异质复合物的结构和电子性质。

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《RSC Advances》 |2014年第93期|共14页
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Das Sameeran Kr.; Mahanta Sanjeev P.; Bania Kusum K.;
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1. Oxidative coupling of 2-naphthol by zeolite-Y supported homo and heterometallic trinuclear acetate clusters [J] . Das Sameeran Kr., Mahanta Sanjeev P., Bania Kusum K. RSC Advances . 2014,第93期

机译：沸石-Y负载的均相和异金属三核醋酸盐簇对2-萘酚的氧化偶联
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Oxidative coupling of 2-naphthol by zeolite-Y supported homo and heterometallic trinuclear acetate clusters

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