Visible-Light-Mediated Photocatalytic Aerobic Dehydrogenation of N-heterocycles by Surface-Grafted TiO<sub>2</sub> and 4-amino-TEMPO
作者:Narmina O. Balayeva、Nan Zheng、Ralf Dillert、Detlef W. Bahnemann
DOI:10.1021/acscatal.9b03322
日期:2019.12.6
dehydrogenation reaction. Both the selectivity and the yield are further enhanced by grafting 0.1 wt % of Ni(II) ions onto the TiO2 surface. It is proposed that the basic reactant adsorbs at Lewis acid sites present at the TiO2 surface. The dehydrogenation reaction is initiated by visible-light excitation of the resulting surface complex and a subsequent single-electron transfer from the excited N-heterocycle
在此,介绍了在市售的产生相应杂芳烃的二氧化钛光催化剂的含O 2的悬浮液中N-杂环如四氢喹啉,四氢异喹啉和二氢吲哚的可见光诱导的脱氢。发现4-氨基-2,2,6,6-四甲基哌啶基氧基(4-氨基-TEMPO)显示出有益的作用,因为它增加了产率并改善了脱氢反应的选择性。通过将0.1重量%的Ni(II)离子接枝到TiO 2表面上,进一步提高了选择性和产率。提出碱性反应物吸附在TiO 2上存在的路易斯酸位点上表面。脱氢反应是通过可见光激发所得表面配合物并随后将单电子从受激N杂环通过TiO 2的导带转移到O 2引发的。Ni(II)离子可能充当TiO 2和O 2的导带之间的电子转移桥,而TEMPO衍生物被认为是参与生成的活性氧物种反应的选择性氧化还原介体。