Direct 103Rh n.m.r. studies on [Rh4(C0)12-xLx] [L = P(OPh)3, x = 1-4] at low temperatures support the solution structures previously proposed and, although the apical rhodium resonance always occurs at lowest frequency, there is little variation in d(103Rh) with increasing ligand substitution. Measurements of 13C-{l03Rh} allow unambiguous assignment of the 13C n.m.r. spectra when x = 1 and 3 and d(13COax) is always at lowest frequency with 1J(103Rh-13C0ax) = 1J(103Rh-13COap) < 1J(103Rh-13COrad); this suggests a new assignment for the l3C n.m.r. spectrum of [Rh4(C0)12].
Heaton, B., Strona, L., DELLA PERGOLA, R., Garlaschelli, L., Sartorelli, U., Sadler, I. (1983). MULTINUCLEAR MAGNETIC-RESONANCE STUDIES ON [RH4(CO)12-1-4P(OPH)3-1-4]. JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS(1), 173-175 [10.1039/dt9830000173].
MULTINUCLEAR MAGNETIC-RESONANCE STUDIES ON [RH4(CO)12-1-4P(OPH)3-1-4]
DELLA PERGOLA, ROBERTO;
1983
Abstract
Direct 103Rh n.m.r. studies on [Rh4(C0)12-xLx] [L = P(OPh)3, x = 1-4] at low temperatures support the solution structures previously proposed and, although the apical rhodium resonance always occurs at lowest frequency, there is little variation in d(103Rh) with increasing ligand substitution. Measurements of 13C-{l03Rh} allow unambiguous assignment of the 13C n.m.r. spectra when x = 1 and 3 and d(13COax) is always at lowest frequency with 1J(103Rh-13C0ax) = 1J(103Rh-13COap) < 1J(103Rh-13COrad); this suggests a new assignment for the l3C n.m.r. spectrum of [Rh4(C0)12].
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