A Monomeric Aluminum Imide (Iminoalane) with Al–N Triple-Bonding : Bonding Analysis and Dispersion Energy Stabilization
Abstract
The reaction of :AlAriPr8 (AriPr8 = C6H-2,6-(C6H2-2,4,6-iPr3)2-3,5-iPr2) with ArMe6N3 (ArMe6 = C6H3-2,6-(C6H2-2,4,6-Me3)2) in hexanes at ambient temperature gave the aluminum imide AriPr8AlNArMe6 (1). Its crystal structure displayed short Al–N distances of 1.625(4) and 1.628(3) Å with linear (C–Al–N–C = 180°) or almost linear (C–Al–N = 172.4(2)°; Al–N–C = 172.5(3)°) geometries. DFT calculations confirm linear geometry with an Al–N distance of 1.635 Å. According to energy decomposition analysis, the Al–N bond has three orbital components totaling −1350 kJ mol–1 and instantaneous interaction energy of −551 kJ mol–1 with respect to :AlAriPr8 and ArMe6N̈:. Dispersion accounts for −89 kJ mol–1, which is similar in strength to one Al–N π-interaction. The electronic spectrum has an intense transition at 290 nm which tails into the visible region. In the IR spectrum, the Al–N stretching band is calculated to appear at ca. 1100 cm–1. In contrast, reaction of :AlAriPr8 with 1-AdN3 or Me3SiN3 gave transient imides that immediately reacted with a second equivalent of the azide to give AriPr8Al[(NAd)2N2] (2) or AriPr8Al(N3){N(SiMe3)2} (3).
Main Authors
Format
Articles
Research article
Published
2021
Series
Subjects
Publication in research information system
Publisher
American Chemical Society (ACS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202106073506Use this for linking
Review status
Peer reviewed
ISSN
0002-7863
DOI
https://doi.org/10.1021/jacs.1c02463
Language
English
Published in
Journal of the American Chemical Society
Citation
- Queen, J. D., Irvankoski, S., Fettinger, J. C., Tuononen, H. M., & Power, P. P. (2021). A Monomeric Aluminum Imide (Iminoalane) with Al–N Triple-Bonding : Bonding Analysis and Dispersion Energy Stabilization. Journal of the American Chemical Society, 143(17), 6351-6356. https://doi.org/10.1021/jacs.1c02463
Funder(s)
European Commission
Funding program(s)
ERC Consolidator Grant
ERC Consolidator Grant
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Additional information about funding
We thank the US National Science Foundation (CHE156551) for supporting this work and for the purchase of a dual source X-ray diffractometer (CHE-0840444). This project received funding from the European Research Council under the European Union’s Horizon 2020 research and innovation programme (grant agreement #772510 to H.M.T.).
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