Synthesis and molecular structure of [Rh(η ⁵-C₅H₅)(coe)(PtBu₂H)] (coe=cis-cyclooctene)

Abstract

The synthesis and structural characterization of the new olefinic complex [Rh(η5-C5H5)(coe)(PtBu2H)] (2, coe = cis-cyclooctene) is reported. The title compound was easily prepared in good yield by a thermolytic approach using [Rh(η5-C5H5)(coe)2] (1) and the secondary phosphane in toluene under reflux conditions. The compound 2 has been characterized by NMR spectroscopy and microanalysis. Single crystals of 2 were grown from n-hexane and the molecular structure has been established by X-ray diffraction.

An Entry to Double Phosphanyl‐Bridged Dinuclear Rhodium(II) Complexes

“…Thus for 2a a doublet at 47.8 ppm ( J RhP = 208.3 Hz, CD 2 Cl 2 ) and for 2b a doublet at 20.5 ppm ( J RhP = 209.3 Hz, CD 2 Cl 2 ) was found. These coupling constants agreed very well with the observed one of 2c , and also for the closely related compound [RhCp(C 2 H 4 )(PPh 3 )] similar data were reported ( δ = 59.4, d, J RhP = 210 Hz, C 6 D 6 ) …”

“…Some time ago, the coordination chemistry of secondary phosphines was reviewed and important synthetic applications of complexes bearing these ligands were reported . Recently we described the synthesis and crystal structure of the olefinic complex [RhCp(coe)(P t Bu 2 H)] (coe = cis ‐cyclooctene) which was obtained by reacting [RhCp(coe) 2 ] ( 1 ) with the corresponding secondary phosphine in refluxing toluene . In the past we showed that rhodium complexes containing labile coe ligands are suitable precursors to introduce secondary phosphine ligands .…”