A platinum-cyclobutene complex: preparation and structure of bis(triphenylphosphine)-(1,2-dicyanocyclobutene)platinum(0)

Robert B. Osborne*, Huntley C. Lewis, James A Ibers

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The reaction of Pt(C2H4)(PPh3)2 with 1,2-dicyanocyclobutene affords the new complex bis(triphenylphosphine)(1,2-dicyanocyclobutene)platinum(0), Pt((NC) CC(CN)CH2CH2)(PPh3)2. The complex has been characterized spectroscopically and by means of a low-temperature X-ray diffraction study. The 31P NMR spectrum displays a singlet at 24.34 ppm downfield from external 85% H3PO4 with 195Pt satellites (1J(195Pt31P) 3561 Hz), consistent with the equivalence of the two PPh3 groups in the complex. The material crystallizes in space group {A figure is presented} P21/n of the monoclinic system with four formula units in a cell at -150°C of a 14.525(3), b 11.981(3),c 19.721(6) Å, β 98.22(1)°. Based on a total of 14108 observations and 173 variables the structure has been refined to values of R and Rw on Fo2 of 0.044 and 0.073, respectively. The cyclobutene is attached to the P2Pt moiety through interaction with the double bond. The resultant P2PtC2 portion of the molecule is essentially planar. The PtP distances are 2.284(1) and 2.301(1) Å and the PtC distances are 2.091(3) and 2.077(3) Å. The 1,2-dicyanocyclobutene portion of the complex is essentially planar, with the angle between this plane and that of the P2PtC2 plane being 62.6°. The single bonds within the ring have lengths of 1.542(4), 1.546(5), and 1.541(5) Å, while the former double bond has on coordination lengthened to a value of 1.504(4) Å.

Original languageEnglish (US)
Pages (from-to)125-135
Number of pages11
JournalJournal of Organometallic Chemistry
Volume208
Issue number1
DOIs
StatePublished - Mar 17 1981

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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