Elongated Dihydrogen versus Compressed Dihydride in Osmium Complexes

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• 作者：Dr. Beatriz Eguillor ; Prof. Dr. Miguel A. Esteruelas ; Virginia Lezá ; un ; Dr. Montserrat Olivá ; n and Dr. Enrique O&ntilde ; ate
• 刊名：Chemistry - A European Journal
• 出版年：2017
• 出版时间：January 31, 2017
• 年：2017
• 卷：23
• 期：7
• 页码：1526-1530
• 全文大小：488K
• ISSN：1521-3765

文摘

Small modifications on the co-ligands of complexes containing two coordinated hydrogen atoms can determine the elongated dihydrogen versus compressed dihydride nature of these species and therefore their chemical behavior. 2,6-diphenylpyridine favors the formation of the osmium(IV) cation [OsH₂(C₆H₄pyPh)(Pm>im>Pr₃)₂]⁺, whereas 2-phenoxy-6-phenylpyridine, which contains an oxygen atom between the heterocycle and one of the phenyl groups, stabilizes the osmium(II) elongated dihydrogen species [Os(C₆H₄pyOPh)(η²-H₂)(Pm>im>Pr₃)₂]⁺. In contrast to the latter, the former shows a marked tendency to undergo reductive elimination of the heterocycle.