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Structural and electronic studies of substituted m-terphenyl lithium complexes

Valentine, Andrew J.; Geer, Ana M.; Taylor, Laurence J.; Teale, Andrew M.; Wood, Katherine E.; Williams, Huw E. L.; Lewis, William; Argent, Stephen P.; McMaster, Jonathan; Kays, Deborah L.

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Authors

Andrew J. Valentine

Ana M. Geer

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LAURENCE TAYLOR Laurence.Taylor@nottingham.ac.uk
Teaching Associate in Organic Chemistry

ANDREW TEALE Andrew.Teale@nottingham.ac.uk
Professor of Computational and Theoretical Chemistry

Katherine E. Wood

HUW WILLIAMS HUW.WILLIAMS@NOTTINGHAM.AC.UK
Senior Research Fellow

William Lewis

DEBORAH KAYS DEBORAH.KAYS@NOTTINGHAM.AC.UK
Professor of Inorganic Chemistry



Abstract

The effect of para-substitution upon the structural and electronic properties of a series of m-terphenyl lithium complexes [R-Ar#-Li]2 (R = t-Bu 1, SiMe32, H 3, Cl 4, CF35; where R-Ar# = 2,6-{2,6-Xyl}2-4-R-C6H2 and 2,6-Xyl = 2,6-Me2C6H3) has been investigated. X-ray crystallography reveals the complexes to be structurally similar, with little variation in C-M-C bond lengths and angles across the series. However, in-depth NMR spectroscopic studies reveal notable electronic differences, showing a linear correlation between the 7Li{1H} NMR chemical shifts of the para-substituted complexes and their Hammett constants. The flanking methyl protons exhibit a similar electronic shift in the 1H NMR spectra, which has been rationalised by the presence of through-space Li⋯H interactions, as evidenced by two-dimensional 7Li-1H heteronuclear Overhauser spectroscopy (HOESY). In both cases, electron-withdrawing substituents are found to cause an upfield peak shift. A computational analysis is employed to account for these trends.

Citation

Valentine, A. J., Geer, A. M., Taylor, L. J., Teale, A. M., Wood, K. E., Williams, H. E. L., …Kays, D. L. (2021). Structural and electronic studies of substituted m-terphenyl lithium complexes. Dalton Transactions, 50(2), 722-728. https://doi.org/10.1039/d0dt03972a

Journal Article Type Article
Acceptance Date Dec 3, 2020
Online Publication Date Dec 8, 2020
Publication Date Jan 14, 2021
Deposit Date Feb 18, 2021
Publicly Available Date Feb 18, 2021
Journal Dalton Transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 50
Issue 2
Pages 722-728
DOI https://doi.org/10.1039/d0dt03972a
Keywords Inorganic Chemistry
Public URL https://nottingham-repository.worktribe.com/output/5173154
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2021/DT/D0DT03972A
Additional Information : This document is Similarity Check deposited; : Supplementary Information; : Crystal Structure Data; : Andrew J. Valentine (ORCID); : Andrew J. Valentine (ResearcherID); : Ana M. Geer (ORCID); : Laurence J. Taylor (ORCID); : Andrew M. Teale (ORCID); : Huw E. L. Williams (ORCID); : William Lewis (ORCID); : William Lewis (ResearcherID); : Stephen P. Argent (ORCID); : Stephen P. Argent (ResearcherID); : Jonathan McMaster (ORCID); : Jonathan McMaster (ResearcherID); : Deborah L. Kays (ORCID); : Deborah L. Kays (ResearcherID); : Single-blind; : Received 19 November 2020; Accepted 3 December 2020; Accepted Manuscript published 8 December 2020; Advance Article published 21 December 2020

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