Dehydrogenation of N-ethyl perhydrocarbazole catalyzed by PCP pincer iridium complexes: Evaluation of a homogenous hydrogen storage system

Zhaohui Wang; Ian Tonks; Jack Belli; Craig M. Jensen

doi:10.1016/j.jorganchem.2009.03.052

Dehydrogenation of N-ethyl perhydrocarbazole catalyzed by PCP pincer iridium complexes: Evaluation of a homogenous hydrogen storage system

Zhaohui Wang, Ian Tonks, Jack Belli, Craig M. Jensen

Research output: Contribution to journal › Article › peer-review

101 Scopus citations

Abstract

The iridium complexes IrH₂{C₆H₃-2,6-(CH₂PBu^t₂)₂ (1), IrH₂{C₆H₃-2,6-(CH₂PPrⁱ₂)₂ (2), and IrHCl{C₆H₃-2,6-(OPBu^t₂)₂ (3) have been found to be highly active catalysts for the dehydrogenation of N-ethyl perhydrocarbazole at 200 °C. However, dehydrogenation to the fully unsaturated ethyl carbazole does not occur in most instances. Complex 3 is the most active catalyst and shows reasonable activity even at 150 °C. No signs of dehydrogenation were found in experiments conducted at 100 °C. This apparently reflects the thermodynamic constraints imposed by the high enthalpy of dehydrogenation of the substrate.

Original language	English (US)
Pages (from-to)	2854-2857
Number of pages	4
Journal	Journal of Organometallic Chemistry
Volume	694
Issue number	17
DOIs	https://doi.org/10.1016/j.jorganchem.2009.03.052
State	Published - Aug 1 2009
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported by General Motors Corporation.

Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.

Keywords

Catalytic dehydrogenation
Hydrogen storage
Iridium complexes
PCP pincer complex
Perhydrocarbazole

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title = "Dehydrogenation of N-ethyl perhydrocarbazole catalyzed by PCP pincer iridium complexes: Evaluation of a homogenous hydrogen storage system",

abstract = "The iridium complexes IrH2{C6H3-2,6-(CH2PBut2)2 (1), IrH2{C6H3-2,6-(CH2PPri2)2 (2), and IrHCl{C6H3-2,6-(OPBut2)2 (3) have been found to be highly active catalysts for the dehydrogenation of N-ethyl perhydrocarbazole at 200 °C. However, dehydrogenation to the fully unsaturated ethyl carbazole does not occur in most instances. Complex 3 is the most active catalyst and shows reasonable activity even at 150 °C. No signs of dehydrogenation were found in experiments conducted at 100 °C. This apparently reflects the thermodynamic constraints imposed by the high enthalpy of dehydrogenation of the substrate.",

keywords = "Catalytic dehydrogenation, Hydrogen storage, Iridium complexes, PCP pincer complex, Perhydrocarbazole",

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AU - Tonks, Ian

AU - Belli, Jack

AU - Jensen, Craig M.

PY - 2009/8/1

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N2 - The iridium complexes IrH2{C6H3-2,6-(CH2PBut2)2 (1), IrH2{C6H3-2,6-(CH2PPri2)2 (2), and IrHCl{C6H3-2,6-(OPBut2)2 (3) have been found to be highly active catalysts for the dehydrogenation of N-ethyl perhydrocarbazole at 200 °C. However, dehydrogenation to the fully unsaturated ethyl carbazole does not occur in most instances. Complex 3 is the most active catalyst and shows reasonable activity even at 150 °C. No signs of dehydrogenation were found in experiments conducted at 100 °C. This apparently reflects the thermodynamic constraints imposed by the high enthalpy of dehydrogenation of the substrate.

AB - The iridium complexes IrH2{C6H3-2,6-(CH2PBut2)2 (1), IrH2{C6H3-2,6-(CH2PPri2)2 (2), and IrHCl{C6H3-2,6-(OPBut2)2 (3) have been found to be highly active catalysts for the dehydrogenation of N-ethyl perhydrocarbazole at 200 °C. However, dehydrogenation to the fully unsaturated ethyl carbazole does not occur in most instances. Complex 3 is the most active catalyst and shows reasonable activity even at 150 °C. No signs of dehydrogenation were found in experiments conducted at 100 °C. This apparently reflects the thermodynamic constraints imposed by the high enthalpy of dehydrogenation of the substrate.

KW - Catalytic dehydrogenation

KW - Hydrogen storage

KW - Iridium complexes

KW - PCP pincer complex

KW - Perhydrocarbazole

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Dehydrogenation of N-ethyl perhydrocarbazole catalyzed by PCP pincer iridium complexes: Evaluation of a homogenous hydrogen storage system

Abstract

Bibliographical note

Keywords

UN SDGs

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