Phosphorus-31 nuclear magnetic resonance study of tertiary phosphine derivatives of Group VI metal carbonyls

Reaction of pentacarbonyl(η2-bis(trimethylsilyl)ethyne)tungsten(0) with tricyclohexylphosphine: X-ray structure of pentacarbonyltricyclohexylphosphinetungsten(0)

“…In the 31 P-NMR spectrum of W(CO) 5 (PCy 3 ), one observes a signal at 33.43 ppm, accompanied by the 183 W satellites (the 183 W Á/ 31 P coupling constant is 232 Hz, similar to the values observed for the W(CO) 5 (PR 3 ) complexes [19]). …”

Hypercoordinate PII, PIII, and PIV Phosphorus Derivatives with Intramolecular Coordination by Donor Groups

“…The pattern of CO stretching bands in the IR spectrum of complex 52 (2012, 1885, 1856 cm Ϫ1 ) is similar to that seen for 54 (2018, 1889, 1832 cm Ϫ1 ), but different from that in the case of complex 51 (2070, 1978, 1834 cm Ϫ1 ). This latter spectrum closely resembles that of Ph 3 PW(CO) 5 (2075, 1980, 1938 cm Ϫ1 ) [40] .…”

Nuclear magnetic resonance studies of tertiary phosphine hydrobromides

“…methyl) would have the smallest angles in the uiiprotonated species and would change most on protonation, resulting in the largest chemical shift on protonation. This idea was presented earlier with respect to chemical shifts on coordination of tertiary phosphines with chromium carbonyl (9). This concept does explain the difference in the chemical shifts on protoilation between the series (constant R with a different number of phenyl groups) and within a series (constant number of phenyls with variable R).…”