Crystal structures of trans-acetyl­dicarbon­yl(η5-cyclo­penta­dien­yl)(di­methyl­phenyl­phosphane)molybdenum(II) and trans-acetyl­dicarbon­yl(η5-cyclo­penta­dien­yl)(ethyl­diphenyl­phosphane)molybdenum(II)

• Published in: Acta crystallographica. Section E, Structure reports online Vol. 70; no. Pt 10; pp. 216 - 220
• Main Authors: Whited, Matthew T., Hofmeister, Gretchen E., Hodges, Connor J., Jensen, Laramie T., Keyes, Samuel H., Ngamnithiporn, Aurapat, Janzen, Daron E.
• Format: Journal Article
• Language: English
• Published: International Union of Crystallography 20.09.2014
• Subjects: Research Communications
• ISSN: 1600-5368
• DOI: 10.1107/S1600536814020534

The crystal structures of the title compounds are compared, showing mol­ecular parameters that reflect the relative steric pressure of their respective phosphine ligands. Their supra­molecular properties are distinct but in both cases are organized around short C—H⋯O contacts involving the acetyl ligands. The title compounds, [Mo(C 5 H 5 )(COCH 3 )P(CH 3 ) 2 (C 6 H 5 )(CO) 2 ], (1), and [Mo(C 5 H 5 )(COCH 3 )P(C 2 H 5 )(C 6 H 5 ) 2 )(CO) 2 ], (2), have been prepared by phosphine-induced migratory insertion from [Mo(C 5 H 5 )(CO) 3 (CH 3 )]. Both complex mol­ecules exhibit a four-legged piano-stool geometry with trans -disposed carbonyl ligands along with Mo—P bond lengths and C—Mo—P angles that reflect the relative steric pressure of the respective phosphine ligand. The structure of compound (1) exhibits a layered arrangement parallel to (100). Within the layers mol­ecules are linked into chains along [001] by non-classical C—H⋯O inter­actions between the acetyl ligand of one mol­ecule and the phenyl and methyl phosphine substituents of another. In the structure of complex (2), a chain motif of centrosymmetrical dimers is found along [010] through C—H⋯O inter­actions.