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These complexes exhibit four-legged piano-stool geometries with molecular structures quite similar to each other and to related acetyl complexes. The extended structures of the three complexes differ somewhat, with the <jats:italic>para<\/jats:italic> substituent of the triarylphosphine of (<jats:bold>2<\/jats:bold>) (fluoro) or (<jats:bold>3<\/jats:bold>) (methoxy) engaging in non-classical C\u2014H...F or C\u2014H...O hydrogen-bonding interactions. The structure of (<jats:bold>3<\/jats:bold>) exhibits modest disorder in the position of one Cl atom of the dichloromethane solvent, which was modeled with two sites showing approximately equivalent occupancies [0.532\u2005(15) and 0.478\u2005(15)].<\/jats:p>","DOI":"10.1107\/s2056989021008008","type":"journal-article","created":{"date-parts":[[2021,8,10]],"date-time":"2021-08-10T12:10:30Z","timestamp":1628597430000},"page":"912-918","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crystal structures of phosphine-supported (\u03b7<sup>5<\/sup>-cyclopentadienyl)molybdenum(II) propionyl complexes"],"prefix":"10.1107","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1193-9078","authenticated-orcid":true,"given":"Matthew T.","family":"Whited","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1337-9537","authenticated-orcid":true,"given":"Margaret A.","family":"Ball","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9196-462X","authenticated-orcid":true,"given":"Alison","family":"Block","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Benjamin A.","family":"Brewster","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"LouLou","family":"Ferrer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helen J.","family":"Jin-Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8523-0176","authenticated-orcid":true,"given":"Colby J.","family":"King","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jamie D.","family":"North","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Inger L.","family":"Shelton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David G.","family":"Wilson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2021,8,10]]},"reference":[{"key":"jq2008_bb1","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1016\/0022-328X(91)86122-7","volume":"407","author":"Adams","year":"1991","journal-title":"J. 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