Preparation, Molecular Structure, and Solution Properties of 1-[1,1ʹ-Bis(Diphenylphosphino)ferrocene]palladatetraborane

Catherine E. Housecraft, Steven M. Owen, Paul R. Raithby, Bilal A.M. Shaykh

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1-[1,1ʹ-Bis(diphenylphosphino)ferrocene]palladatetraborane, 1-{(dppf)Pd}B3H7 (1), has been prepared by the reaction of (dppf)PdCl2 with octahydrotriborate(1-). The molecular structure of 1 has been determined: triclinic, P1 (No. 2), a = 9.557 (1), b = 9.632 (1), c = 18.547 (2) Å, α = 75.39 (1), β = 80.72 (1), γ = 73.41 (1)°, Z = 2, V = 1575.9 (5) Å3, RF = 0.025. The triborane ligand is symmetrically disposed (within esd’s) with respect to the Pd atom; the central Pd–B distance is only slightly shorter (2.154 (3) Å) than the remaining two (2.190 (3) and 2.182 (3) Å). Borane hydrogen atoms have been located directly. Variable-temperature1H NMR spectroscopic studies indicate that two fluxional processes involving the {(dppf)Pd} fragment are operational; at T ≥ 203 K, facile mutual twisting of the cyclopentadienyl rings occurs, while at T ≥ 293 K, inversion at each phosphorus atom is accessed. The borane ligand itself appears to be static on the 400-MHz time scale, although inversion at the phosphorus atoms effectively renders equivalent the two distinct terminal hydrogen atoms on each terminal boron atom. Complex 1 shows an irreversible redox process, contrasting with reversible processes observed for dppf and (dppf)PdCl2.

Original languageEnglish
Pages (from-to)1617-1623
Number of pages7
Issue number5
Publication statusPublished - 1 May 1990

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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