Preparations and reactions of tris(pentafluorophenyl)phosphine, phenylbis(pentafluorophenyl)phosphine, and diphenylpentafluorophenylphosphine complexes of rhodium

Chemistry of Diazaphosphole−Phosphines. 3. Complexation Reactions of Substituted (Fluoro, Dimethylamino, or Trifluoroethoxy)diazaphosphinephospholes with Ru(II), Rh(I), and Rh(III) Precursors: The Crystal and Molecular Structures of Cyclopentadienylbis(κP-4-(difluorophosphino)- 2,5-dimethyl-2H-1,2,3σ2-diazaphosphole Rhodium(I) andtrans-Chlorocarbonylbis(κP-4-(dimethylaminophosphino)- 2,5-dimethyl-2H-1,2,3σ2-diazaphosphole Rhodium(I)

“…The lack of systematic substitutional patterns of the phosphinediazaphosphole ligands investigated herein does not allow for a complete classification of the ligand properties which devolve from the substitutions on the exocyclic phosphorus center, but some understanding can be gleaned from the IR spectra. The carbonyl infrared stretching frequency ν(CO) for 7 is 1978 cm -1 , which is comparable to values for trans- (phosphine)Rh(CO)Cl with the ligands PPh 3 (1980 cm -1 ) and (C 6 F 5 ) 2 PPh (1982 cm -1 ), thus suggesting that 2 behaves with a basicity and back-donation character similar to these aryl phosphines. The ν(CO) stretching frequency of 8 is 2010 cm -1 , which suggests that the ligating characteristics of 3 are more similar to those of the phosphites P(OMe) 3 (2014 cm -1 ) and P(OPh) 3 (2018 cm -1 ), and this is reinforced by the fact that in substitution reactions with CpRh(CO) 2 both CO ligands are replaced, a reaction characteristic of phosphites but not phosphines.…”

1,2-Bis[bis(pentafluorophenyl)phosphino]ethane: synthesis, characterization, and some comparisons to 1,2-bis(diphenylphosphino)ethane

“…A solution of bromopentafluorobenzene (22 g, 90 mmol) in ether (50 mL) was added dropwise to the stirred suspension. The suspension was allowed to warm to room temperature, and additional portions (14 g, 75 mmol) of 1,2-dibromoethane were added dropwise.…”

Structural and electronic impact of fluorine in the ortho positions of triphenylphosphine and 1,2-bis(diphenylphosphino)ethane; a comparison of 2,6-difluorophenyl- with pentafluorophenyl-phosphines

“…The PPh(C 6 H 3 F 2 -2,6) 2 ligands of 12 also show disorder between the phenyl ring and one difluorophenyl ring which was modelled by 20% occupancy of the fluorine atom sites F (12) and F( 16) and 90% occupancy of sites F (22), F(26), F(32) and F (36). The P-Pt-Cl angles are 85.60 (8) and 94.40(8)Њ, which are the same within experimental error as those of the tris(pentafluorophenyl)phosphine analogue trans-[PtCl 2 {P(C 6 F 5 ) 3 } 2 ]. 13 The Pt-Cl distance is the same as that for trans-[PtCl 2 -{P(C 6 F 5 ) 3 } 2 ].…”