Metal–metal interaction in a binuclear palladium(II) system. The (dσ*→ pσ) transition and the X-ray crystal structure of [Pd2(dppm)2(CN)4][dppm = bis(diphenylphosphino)methane]

Abstract

The complex [Pd₂(dppm)₂(CN)₄][dppm = bis(diphenylphosphino)methane] displays an intense absorption band at 272 nm (ε_max= 5.2 × 10⁴ dm³ mol^–1 cm^–1) attributed to the d_σ*→ p_σ transition. Crystals of the complex are monoclinic, space group P2₁/n(no. 14, non-standard) with a= 11.476(2), b= 17.565(2), c= 13.964(2)Å, β= 95.07(1)° and Z= 2. The measured intramolecular Pd ⋯ Pd distance is 3.276(1)Å.