Determination of the molecular structures of tri(t-butyl)phosphine oxide and tri(t-butyl)phosphine imide in the gas phase by electron diffraction

David W.H. Rankin, Heather E. Robertson, Ragnhild Seip, Hubert Schmidbaur, Günther Blaschke

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32 Scopus citations

Abstract

The molecular structures of the oxide and imide of tri(t-butyl)phosphine in the gas phase have been determined by electron diffraction. For PBut3O important parameters (ra) are: r(PO) 159.0(12), r(P-C) 188.8(6), r(C-C) 151.9(3) pm, OPC 106.1(5), and CCC 109.1(4)°. The butyl groups are tilted 3.1(8)° away from each other, and twisted 15.8(7)° away from the positions in a structure with C3v symmetry, thus minimising steric interactions between the groups. For PBut3NH important parameters are: r(P=N) 165.2(11), r(P-C) 191.3(6), r(C-C) 153.2(2) pm, NPC 109.6(7), and CCC 107.8(5)°, the tilt and twist angles of the butyl groups are -2.3(11) and 18.5(14)° respectively. The structures are such that the oxygen and imide group are sterically well protected from attack, thus accounting for the remarkable chemical and thermal stability of the compounds.

Original languageEnglish
Pages (from-to)827-830
Number of pages4
JournalJournal of the Chemical Society. Dalton Transactions
Issue number4
DOIs
StatePublished - 1985
Externally publishedYes

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