Hydride oxidation from a titanium–aluminum bimetallic complex: insertion, thermal and electrochemical reactivity
Abstract
We report the synthesis and reactivity of paramagnetic heterometallic complexes containing a Ti(III)-μ-H-Al(III) moiety. Combining different stoichiometries amounts of Cp2TiCl and KH3AlC(TMS)3 (Cp = cyclopentadienyl, TMS = trimethylsilyl) resulted in the formation of either bimetallic Cp2Ti(μ-H)2(H)AlC(TMS)3 (2) or trimetallic (Cp2Ti)2(μ-H)3(H)AlC(TMS)3 (3) via salt metathesis pathways. While these complexes were indefinitely stable at room temperature, the bridging hydrides were readily activated upon exposure to heteroallenes, heating, or electrochemical oxidation. In each case, formal hydride oxidation occurred, but the isolated product maintained the +3 oxidation state at both metal centers. The nature of this reactivity was explored using deuterium labelling experiments and Density Functional Theory (DFT) calculations. It was found that while C–H activation from the Ti(III) bimetallic may occur through a σ-bond metathesis pathway, chemical oxidation to Ti(IV) promotes bimolecular reductive elimination of dihydrogen to form a Ti(III) product.
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1399463
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 7; Journal ID: ISSN 2041-6520
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Brown, Alexandra C., Altman, Alison B., Lohrey, Trevor D., Hohloch, Stephan, and Arnold, John. Hydride oxidation from a titanium–aluminum bimetallic complex: insertion, thermal and electrochemical reactivity. United States: N. p., 2017.
Web. doi:10.1039/c7sc01835e.
Brown, Alexandra C., Altman, Alison B., Lohrey, Trevor D., Hohloch, Stephan, & Arnold, John. Hydride oxidation from a titanium–aluminum bimetallic complex: insertion, thermal and electrochemical reactivity. United States. https://doi.org/10.1039/c7sc01835e
Brown, Alexandra C., Altman, Alison B., Lohrey, Trevor D., Hohloch, Stephan, and Arnold, John. Wed .
"Hydride oxidation from a titanium–aluminum bimetallic complex: insertion, thermal and electrochemical reactivity". United States. https://doi.org/10.1039/c7sc01835e. https://www.osti.gov/servlets/purl/1399463.
@article{osti_1399463,
title = {Hydride oxidation from a titanium–aluminum bimetallic complex: insertion, thermal and electrochemical reactivity},
author = {Brown, Alexandra C. and Altman, Alison B. and Lohrey, Trevor D. and Hohloch, Stephan and Arnold, John},
abstractNote = {We report the synthesis and reactivity of paramagnetic heterometallic complexes containing a Ti(III)-μ-H-Al(III) moiety. Combining different stoichiometries amounts of Cp2TiCl and KH3AlC(TMS)3 (Cp = cyclopentadienyl, TMS = trimethylsilyl) resulted in the formation of either bimetallic Cp2Ti(μ-H)2(H)AlC(TMS)3 (2) or trimetallic (Cp2Ti)2(μ-H)3(H)AlC(TMS)3 (3) via salt metathesis pathways. While these complexes were indefinitely stable at room temperature, the bridging hydrides were readily activated upon exposure to heteroallenes, heating, or electrochemical oxidation. In each case, formal hydride oxidation occurred, but the isolated product maintained the +3 oxidation state at both metal centers. The nature of this reactivity was explored using deuterium labelling experiments and Density Functional Theory (DFT) calculations. It was found that while C–H activation from the Ti(III) bimetallic may occur through a σ-bond metathesis pathway, chemical oxidation to Ti(IV) promotes bimolecular reductive elimination of dihydrogen to form a Ti(III) product.},
doi = {10.1039/c7sc01835e},
journal = {Chemical Science},
number = 7,
volume = 8,
place = {United States},
year = {Wed May 31 00:00:00 EDT 2017},
month = {Wed May 31 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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