Crystal Structure Dependence for Reactivities of B 12 -TiO 2 Hybrid Catalysts with Anatase and Rutile Forms
Crystal Structure Dependence for Reactivities of B 12 -TiO 2 Hybrid Catalysts with Anatase and Rutile Forms
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锐钛矿型和金红石型 B 12 -TiO 2 杂化催化剂反应活性的晶体结构依赖性
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Hisaeda
中科院分区：
文献类型：
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作者：
H. Shimakoshi;Y. Nagami;Y. Hisaeda
摘要：研究了B 12 - TiO 2复合催化剂在紫外光照射下对苯乙基溴的脱溴反应.催化效率与TiO 2的种类有关.金红石型TiO 2比金红石型TiO 2具有更好的上级性能.产物的选择性也取决于TiO 2的晶体结构，并且与金红石型TiO 2相比，金红石型TiO 2对形成偶联产物2，3-二苯基丁烷显示出高的选择性。氧化钛（TiO 2）由于其半导体性质，在有机合成、太阳能电池器件、抗生素和环境应用以及表面自清洁等领域的应用日益广泛。1-4我们最近报道了一种钴胺素衍生物（B 12），氰水钴胺酸，[（CN）（H2 O）Co B（III）7 COOH]Cl与TiO 2复合的制备和催化作用。5-10天然存在的B 12（钴胺素）依赖性酶催化各种分子转化，从生物化学以及合成有机化学和催化化学的观点来看，这些转化是特别感兴趣的。
ABSTRACT : The debromination of phenethyl bromide by the B 12 - TiO 2 hybrid catalyst under UV light irradiation was investigated. The catalytic efficiency was dependent on the type of TiO 2 . The anatase form of TiO 2 was superior to the rutile form of TiO 2 . The selectivity of the product was also dependent on the crystal structure of TiO 2 , and the rutile form of TiO 2 showed a high selectivity for the formation of the coupling product, 2,3-diphenylbutane, when compared to that of the anatase form of TiO 2 . The application of titanium oxide (TiO 2 ) has increased in various areas such as organic synthesis, solar cell devices, antibiotic and environmental applications, and surface selfcleaning due to its semiconductor property. 1-4 We recently reported the preparation and catalysis of TiO 2 combined with a cobalamin derivative (B 12 ), cyanoaqua cobyrinic acid, [(CN)(H 2 O)Cob(III)7COOH]Cl. 5-10 Naturally-occurring B 12 (cobalamin)-dependent enzymes catalyze various molecular transformations that are of particular interest from the viewpoint of biological chemistry as well as synthetic organic chemistry and catalytic chemistry.