X-RAY-DIFFRACTION STRUCTURE OF THE 1,1'-BIS(DIPHENYLPHOSPHINO)FERROCENE (DPPF)-BRIDGED COMPLEX [(DPPF)AGCL](2) - AN UNEXPECTED PRODUCT FROMTHE REACTION BETWEEN CIS-(BPY)(2)RUCL2 AND DPPF IN THE PRESENCE OF AGBF4

The reaction between cis-Ru(bpy)(2)Cl-2 (where bpy = bipyridine) and t he diphosphine ligand 1,1'-bis(diphenylphosphino)ferrocene (dppf) in t he presence of AgBF4 has led to the isolation of the title compound [A g(dppf)Cl](2). [Ag(dppf)Cl](2) has been structurally characterized by X-ray diffraction analysis, which confirms the bridging mode adopted b y the ancillary dppf ligand and the centrosymmetric nature of this mol ecule. Dimeric [Ag(dppf)Cl](2) crystallizes in the triclinic space gro up P $($) over bar$$ 1, a = 11.426(1) Angstrom, b = 11.509(1) Angstrom , c = 12.786(1) Angstrom, alpha = 68.96(2)degrees, beta = 70.66(2)degr ees, gamma = 71.24(2)degrees, V = 1441(1) Angstrom(3), Z = 1, d(calc) = 1 608 g . cm(-3); R = 0.0445, R(w) = 0.0566 for 4486 observed reflec tions with l > 3 sigma(l)