98087-77-5Relevant academic research and scientific papers
Synthesis of heterobimetallic bis(diphenylphosphino)acetylene-bridged palladium-platinum complexes. Crystal and molecular structure of [PdPtCl4(Ph2PC≡CPPh2) 2]·2CHCl3
Clark, Howard C.,Ferguson, George,Kapoor, Pramesh N.,Parvez, Masood
, p. 3924 - 3928 (2008/10/08)
Reaction of [(PMe2Ph)PdCl(μ-Cl)2PtCl(PMe2Ph)] (I) with 1,2-bis(diphenylphosphino)acetylene yields the heterobimetallic complex [Cl2Pd(Ph2PC≡CPPh2)2PtCl 2] (II). Solution studies using 31P and 195Pt NMR spectra reveal that II exists in an equilibrium of the type 2[Cl2Pd(Ph2PC≡CPPh2)2PtCl 2] ? [Cl2Pd(Ph2PC≡CPPh2)2PdCl 2] + [Cl2Pt(Ph2PC≡CPPh2)2PtCl 2]. Crystals of II [as the bis(chloroform) solvate] are monoclinic, space group P21/n with two formula units in a cell of dimensions a = 14.415 (3) A?, b = 12.149 (3) A?, c = 15.949 (3) A?, and β= 91.33 (2)°. The bimetallic complex lies about a crystallographic inversion center, and the Pd and Pt atoms are mutually disordered. The structure was solved by the heavy-atom method and refined by full-matrix least-squares calculations with anisotropic thermal parameters; R = 0.033 and Rw = (ΣwΔ2/ΣwF02)1/2 = 0.044 for 2407 observed reflections. The unique metal atom has slightly distorted square-planar geometry with mean M-Cl = 2.344 (2) A and mean M-P = 2.244 (2) A?. The strained 10-membered PtPdP4C4 ring system is nonplanar; there is significant bowing of the P-C≡C-P moiety [mean P-C ≡C = 172.2 (3)°] and enlargement of the M-P-C(acetylene) angles from tetrahedral [mean value 121.3 (2)°].
