{"title":"Polymorphism in a secondary phosphine.","authors":"Mo Liu, Keith Izod, Paul G Waddell","doi":"10.1107/S2053229625000555","DOIUrl":null,"url":null,"abstract":"<p><p>Two crystal structures of bis(2,3,5,6-tetramethylphenyl)phosphine, C<sub>20</sub>H<sub>27</sub>P, are reported constituting the first recorded case of polymorphism in a secondary phosphine (R<sub>2</sub>PH). 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.</p>","PeriodicalId":7115,"journal":{"name":"Acta Crystallographica Section C Structural Chemistry","volume":"81 Pt 2","pages":"109-113"},"PeriodicalIF":0.7000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11795654/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Crystallographica Section C Structural Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1107/S2053229625000555","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/30 0:00:00","PubModel":"Epub","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
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.
期刊介绍：
Acta Crystallographica Section C: Structural Chemistry is continuing its transition to a journal that publishes exciting science with structural content, in particular, important results relating to the chemical sciences. Section C is the journal of choice for the rapid publication of articles that highlight interesting research facilitated by the determination, calculation or analysis of structures of any type, other than macromolecular structures. Articles that emphasize the science and the outcomes that were enabled by the study are particularly welcomed. Authors are encouraged to include mainstream science in their papers, thereby producing manuscripts that are substantial scientific well-rounded contributions that appeal to a broad community of readers and increase the profile of the authors.
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