Crystal structures of bis[(ethane-l,2-diyl)- bis(diphenylphosphine)]-palladium(II) and -platinum(II) Dichloride dichloromethane and dichloro[(ethane-l,2-diyl)bis(diphenyl- phosphine)]platinum(II) dichloromethane

The crystal structures of the title compounds have been established by single-crystal X-ray diffraction techniques at 295 K, being refined by least squares to residuals of 0.043, 0.036, 0.036 for 2057, 3176 and 3468 independent ‘observed’ reflections respectively. Crystals of [Pd(diphos)₂] Cl₂ (1) (diphos = Ph₂P(CH₂)₂PPh₂) are monoclinic, P 2₁/c, with a 12.779(9), b 18.084(10), c 12-942(6) Å, β 119.29(5)°, Z2; for the isostructural platinum analogue (2), a 12.789(4), b 18.099(7), c 12.965(4) Å, β 119-39(2)°. Crystals of [PtCl₂(diphos)].CH₂Cl₂, (3), are orthorhombic, P2₁2₁2₁, with a 21 -360(6), β 13-499(4), c 9.551(5) Å, Z 4. Complexes (1) and (2) are also solvated but the nature of the solvation is complicated by disorder and less clearcut than in (3). In (1), Pd-P distances are 2.342(2), 2.347(2) Å in a centrosymmetric molecule; in (2), Pt-P distances are 2.332(2), 2.335(2) Å, while in (3), Pt-P distances are 2.230(2), 2.224(3) A and Pt-Cl are both 2.355(2) Å [cf. 2.233(2), 2.226(2), (2.361(2), 2.357(2)) Å respectively for the previously studied palladium analogue].