59Co quadrupole effects on the 1H, 31P, and 59Co NMR spectra of HFeCo3(CO)9[P(OCH3)3]3 and the 1H NMR spectra of other derivatives

The 1H NMR spectra of HMCo3(CO)12 (M = Fe or Ru) and HFeCo3(CO)sub(12-x)[P(OR)3]sub(x) (x = 1-3, R = CH3; x = 3, R = C2H5 or C6H5) showed very broad signals centered near delta = -21 at 27 0C. The band widths were generally smaller for the compounds of larger molecular volume, at lower temperatures and with higher viscosity of the solvent. These data were interpreted in terms of the quadrupole effects of 59Co nuclei to which the hydride proton was μ3-bonded. Supporting evidence was obtained from the 31P and 59Co NMR spectra and the relaxation time T1 of HFeCo3(CO)9[P(OCH3)3]3. (author)