Heterobimetallic complexes of cis-1,2-bis(diphenylphosphine)ethene containing tin and nickel, palladium or platinum

Abstract

New heterobimetallic complexes of nickel, palladium or platinum and the ligand cis-l,2-bis(diphenylphosphine)-ethene, dppen, and tin were prepared. The transition metal is bonded either directly or via chlorine bridges to the tin atom. The compounds were obtained from precursor complexes of the general formula [M(dppen)Clz] (M = Ni, Pd or Pt) by reaction with Ph3SnH or SnC12.

1,1,1-Tris(diphenylphosphinemethyl)ethane complexes of nickel and platinum with tin

“…A high field 1H n.m.r, spectrum check showed no hydride present in the species, which leaves the question of whether any self association might be present in solution in (1) and (5), which seems very likely. Conductivity experiments were performed in MeNO2 (specific conductivity As = 6.5 x 10-7 f~-1 cm-1) for complexes (1) and (2), giving molar conductivities AM = 5.9 and 9.692 -~ tool -~ cm z, respectively, consistent with a nonelectrolytic nature for both complexes (7). A similar experiment could not be done with the other complexes due to their insolubility in MeNOa.…”

“…they all bond to the platinum atom in the same way. Moreover, the great difference in chemical shifts points to an enhanced transition metal-tdpme interaction in (1). Both (I) and (5) are tetracoordinated transition metals with a 1 + oxidation state; these are formally d 9 species.…”

“…(1) An excess of freshly prepared PhaSnH, obtained from PhaSnC1 and NaBH4 in MeOH (4), was added to a suspension of [Ni(tdpme)C12] (0.4 mmol) in monoglyme under nitrogen and the mixture stirred for 6 h at -15 ~ C, followed by further stirring for 4 h at 25 ~ C. The resulting solution was dried in vacuo, producing a yellow solid which was recrystallized from a 1:1 mixture of CCI4-THF and dried in vacuo. Yield was 0.339 g (82%).…”

Tin, palladium and platinum derivatives of 1,1′-bis(diphenylphosphine)ferrocene. Crystal and molecular structures of 1,1′- bis-(diphenylphosphine)ferrocenedichloropalladium(II) and of 1,1′-bis(diphenylphosphine)ferrocenedichloroplatinum(II)

“…Preparation of complexes (6) and (7) Complexes (6) and (7) were obtained from the reaction of 0.25 mmol of either (4) or (5) with 0.25 mmol of BDPF in MeOH at 60~ and the slow addition of lcm 3 of N2H4.H20. The products precipitated in quantitative yield as very insoluble yellow powders, which were filtered off, then washed with hot H20 followed by Et20 and dried in vacuo.…”