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Lookup NU author(s): Dr Mo Liu, Dr Keith IzodORCiD, Dr Paul Waddell
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Two crystal structures of bis(2,3,5,6-tetramethylphenyl)phosphine, C20H27P, are reported constituting the first recorded case of polymorphism in a secondary phosphine (R2PH). The two structures differ in their conformation and, as a result, the steric hindrance experienced at the phosphorus centre is observed to be dependent on the packing environment. Each polymorph exhibits a distinct supramolecular structure; in polymorph I the molecules are arranged in columns in two directions, whereas polymorph II forms layers. There is a distinct lack of significant intermolecular interactions in either form, with the exception of some weak Me...π interactions observed in polymorph II. These interactions are likely the cause of the variation in the C-P-C angles observed between the two structures.
Author(s): Liu M, Izod K, Waddell PG
Publication type: Article
Publication status: Published
Journal: Acta Crystallographica. Section C, Structural chemistry
Year: 2025
Volume: 81
Issue: Part 2
Pages: 109-113
Online publication date: 30/01/2025
Acceptance date: 21/01/2025
Date deposited: 03/03/2025
ISSN (electronic): 2053-2296
Publisher: Wiley-Blackwell Publishing, Inc.
URL: https://doi.org/10.1107/S2053229625000555
DOI: 10.1107/S2053229625000555
PubMed id: 39907072
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