Acta Cryst. (2008). E64, o421  [ doi:10.1107/S1600536807068547 ]

1,2-Bis{bis[4-(trifluoromethyl)phenyl]phosphino}ethane

M. A. Bork, A. M. Krueger, R. S. Tanke and J. G. Brummer

Abstract: Crystals of the title compound, C₃₀H₂₀F₁₂P₂ or R₂PCH₂CH₂PR₂ (R = 4-C₆H₄CF₃), were inadvertently prepared while attempting to recrystallize a crude sample of trans-Re(Cl)(N₂)(R₂PCH₂CH₂PR₂)₂ from diethyl ether. The molecule lies on a center of inversion. One of the rings lies approximately in the P-C-C-P plane; the dihedral angle is 174.53°.The other ring is not quite perpendicular; the dihedral angle is 71.1°. The compound is isostructural with the R = Ph, 4-C₆H₄CH₃ and 4-C₆H₄CH₂CH₃ analogues. It is well known that the basicity of phosphines and diphosphines can be altered by changing the electron-donating ability of R; however, the structural parameters for the title compound do not significantly differ from those of the aforementioned substituted-phenyl compounds.

Online 11 January 2008

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