Phosphorus-31 nuclear magnetic resonance study of tertiary phosphine derivatives of Group VI metal carbonyls. II. "Mixed" ligand complexes

Abstract

The preparation, infrared spectra in the carbonyl stretching region, and phophorus-31 nmr spectra of nine "mixed" phophorus ligand derivatives of the group VI metal carbonyls are reported. In the two compounds which have phosphorus atoms in cis positions, the phosphorus-phosphorus spin-spin coupling constant is considerably smaller than for those corresponding situations with trans phosphorus atoms.

Molybdenum-95 nuclear magnetic resonance studies on disubstituted molybdenum(0) carbonyls

“…This useful application of 95Mo nmr data was applied in the characterization of the products obtained during the attempted synthesis of trarzsMo(C0)4LL1. Refluxing solutions of ~i s -M o ( c 0 )~L L ' gave a variety of mono-and bis-substituted complexes, as expected (20). As an example, the "MO nmr spectrum (Fig.…”

Tungsten-183-phosphorus-31 spin-spin coupling interactions in pentacarbonyltungsten complexes

“…The force constants listed in Table II By choosing a reference compound such as an amine complex in which the bonding may be assumed to be zero, relative scales of -bonding and -bonding Table II C-0 Stretching Frequencies (cm-1) Force Constants (mdyn/A), andand x-Bonding Parameters for LW(CO) " Precision lowered by weak intensity and poor definition of these peaks. 6 Uncertainties in and estimated in ref 15 to be ±0.12 and 0.08, respectively. 8 Not observed.…”

“…d Measured in carbon disulfide. 6 These values are taken from ref 4. ¡ This coupling constant was obtained from the 19F spectrum by the indor method.…”

Tetrahedral platinum(O) carbonyl. Crystal and molecular structure of tris(triphenylphosphine)carbonylplatinum

“…11.275 (5) A, b = 30.904 (8) A, c = 13.298 (5) Á. ß = 91. 6 (1)°, V = 4677 Á3. Agreement between computed and observed densities has been obtained for Z = 4 (pcaicd = 1.43 g/ cm3 and pmeasd = 1.42 (2) g/'cm3, the latter value being measured by flotation in iodomercurate solutions).…”

“…" All values X104. 6 Theare the coefficients of the form: 2ß -(-&2/3s2 12ß z ™l• mn hfóis "l• ß 23-c The numbers in paren• theses here and in the succeeding tables are the esd's on last significant digits. " PiRi is the first phenyl ring attached to phosphorus 1.…”