A New Modification of Bis(diphenylphosphino)methane Diselenide

In the title compound, C₂₅H₂₂P₂Se₂ (dppmSe₂), the methylene carbon atom lies on a crystallographic twofold axis, in contrast to the previously known modification, which had no imposed symmetry. The conformation is expressed by the torsion angle Se—P...P—Se 148.12 (7)°. Bond lengths and angles are similar to those in other dppmX₂ molecules.

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