Interaction Mechanisms of Ruthenium Hydride Complex with Water and 2,2,2-Trifluoroethanol

Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (20): 2320-2324. Previous Articles Next Articles

单氢钌配合物与水和2,2,2-三氟乙醇的作用机理

尹传奇¹^{,2，陈瑶²，冯权武²，柏正武²，王长芳²，李早英*^,1}

(¹武汉大学化学与分子科学学院武汉 430072)
(²武汉工程大学化工与制药学院武汉 430074)

投稿日期:2007-02-08 修回日期:2007-04-26 发布日期:2007-10-28
通讯作者: 李早英

Interaction Mechanisms of Ruthenium Hydride Complex with Water and 2,2,2-Trifluoroethanol

YIN Chuan-Qi¹^{,2； CHEN Yao²； FENG Quan-Wu²； BAI Zheng-Wu² ；WANG Chang-Fang²； LI Zao-Ying*^,1}

(¹College of Chemistry & Molecular Sciences, Wuhan University, Wuhan 430072)
(²College of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430074)

Received:2007-02-08 Revised:2007-04-26 Published:2007-10-28
Contact: LI Zao-Ying

Abstract

In situ ¹H and ³¹P NMR methods were used to study the reactions of ruthenium hydride complex TpRu(PPh₃)(CH₃CN)H [Tp＝hydrotris(pyrazolyl)borate] with water and acidic HOCH₂CF₃. The result shows that the the products were TpRu(PPh₃)(CH₃CN)(OH) and TpRu(PPh₃)(CH₃CN)(OCH₂CF₃), respectively. The presence of Ru—H…HOH and Ru—H…HOCH₂CF₃ dihydrogen-bonding interactions was observed. The different mechanisms involving the formation of TpRu(PPh₃)(CH₃CN)(OH) and TpRu(PPh₃)(CH₃CN)(OCH₂CF₃) are proposed. In the presence of water, TpRu(PPh₃)(CH₃CN)H reacts with H₂O to produce TpRu(PPh₃)(CH₃CN)(OH) via the intermediates TpRu(PPh₃)(H₂O)H and TpRu(PPh₃)(OH)(η²-H₂). However, in the case of CF₃CH₂OH, the protonation of the hydride ligand by CF₃CH₂OH generates a key species [TpRu(PPh₃)(CH₃CN)(η²-H₂)](OCH₂CF₃), which is then transformed to TpRu(PPh₃)(CH₃CN)(OCH₂CF₃). TpRu(PPh₃)(CH₃CN)(OCH₂CF₃) reacts with H₂ to result in the formation of TpRu(PPh₃)(η²-H₂)H via the intermediate TpRu(PPh₃)(HOCH₂CF₃)H

Key words: ruthenium hydride complex, in situ NMR, intermolecular hydrogen bond, reaction intermediate, reaction mechanism

Cite this article

YIN Chuan-Qi^1,2； CHEN Yao²； FENG Quan-Wu²； BAI Zheng-Wu² ；WANG Chang-Fang²； LI Zao-Ying*^,1. Interaction Mechanisms of Ruthenium Hydride Complex with Water and 2,2,2-Trifluoroethanol[J]. Acta Chimica Sinica, 2007, 65(20): 2320-2324.

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单氢钌配合物与水和2,2,2-三氟乙醇的作用机理

Interaction Mechanisms of Ruthenium Hydride Complex with Water and 2,2,2-Trifluoroethanol

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