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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\n                    <jats:bold>I<\/jats:bold>\n                    the molecules are arranged in columns in two directions, whereas polymorph\n                    <jats:bold>II<\/jats:bold>\n                    forms layers. There is a distinct lack of significant intermolecular interactions in either form, with the exception of some weak Me...\u03c0 interactions observed in polymorph\n                    <jats:bold>II<\/jats:bold>\n                    . These interactions are likely the cause of the variation in the C\u2014P\u2014C angles observed between the two structures.\n                  <\/jats:p>","DOI":"10.1107\/s2053229625000555","type":"journal-article","created":{"date-parts":[[2025,1,24]],"date-time":"2025-01-24T03:35:15Z","timestamp":1737689715000},"page":"109-113","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Polymorphism in a secondary phosphine"],"prefix":"10.1107","volume":"81","author":[{"given":"Mo","family":"Liu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keith","family":"Izod","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7851-7347","authenticated-orcid":true,"given":"Paul G.","family":"Waddell","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2025,1,30]]},"reference":[{"key":"oj3027_bb1","doi-asserted-by":"crossref","first-page":"555","DOI":"10.1107\/S2053229614009449","volume":"70","author":"Avasthi","year":"2014","journal-title":"Acta Cryst. 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