Abstract
The molecular and crystal structures of tris(3-methylphenyl)phosphine, tris(3-methylphenyl)phosphine oxide, tris(3-methylphenyl)phosphine sulfide and tris(3-methylphenyl)phosphine selenide were determined by X-ray diffraction. It was previously indicated that phosphine oxide should be isostructural with phosphine sulfide and phosphine selenide. However, this statement was not confirmed experimentally: the geometrical structure of the phosphine oxide is closer to the geometry of the phosphine. Tris(3-methylphenyl)phosphine, tris(3-methylphenyl)phosphine sulfide and tris(3-methylphenyl)phosphine selenide crystallize in the orthorhombic space group Pbca, while the phosphine oxide molecules in the crystal are packaged in the space group Pca21 with screw axis.
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