| Sumario: | The reaction between [cis-Pt(C≡CR)2L2] (R = Ph, tBu; L2 = 2 PPh3, dppe, COD) and [cis-M(C6F5)2-(THF)2] (M = Pd, Pt; THF = tetrahydrofuran) in a 1:1 molar ratio affords neutral binuclear derivatives of the type [{L2Pt(C≡CR)2}M(C6F5) 2] in which the RC≡C-Pt-C≡CR group is acting as a bidentate ligand to "M(C6F5)2". In contrast, [cis-M(C6F5)2(THF)2] reacts with Q2[cis-Pt(C6F5)2(C≡CR) 2] and Q2-[Pt(C6F5)(C≡CR)3] (R = Ph, Q = PMePh3; R = tBu, Q = NBu4) to give anionic diplatinum and platinum-palladium complexes of types Q2[(C6F5)2Pt(μ-C≡CR) 2M(C6F5)2] and Q2[(C6F5)(C≡CR)Pt(μ-C≡ CR)2Pt(C6F5)2], respectively. The crystal structures of the complexes [{(dppe)Pt(C≡CPh)2}Pt(C6F5)2] (3) and (PMePh3)2[(C6F5) 2Pt(μ-C≡CPh)2Pt(C6F5) 2] (9) have been established by X-ray diffraction methods. 3 is a binuclear complex in which the unit "(dppe)Pt(σ-C≡CPh)2" acts as a chelate metallo ligand to "Pt(C6F5)2". In contrast, the crystal structure for 9 shows that two identical [(C6F5)2Pt-C≡CPh] units are joined together through η2 bonding of C≡CPh groups. This indicates that the complex is formed from the bis(σ-alkynyl)bis(pentafluorophenyl)platinate and the synthon Pt(C6F5)2 via migration of one σ-alkynyl group between the two platinum metal centers. © 1992 American Chemical Society.
|
|---|
