1H-enhanced 103Rh NMR spectroscopy and relaxometry of 103Rh(acac)3 in solution

Abstract

Recently developed polarisation transfer techniques are applied to the 103Rh nuclear magnetic resonance (NMR) of the 103Rh(acac)3 coordination complex in solution. Four-bond 1H-103Rh J couplings of around 0.39 Hz are exploited to enhance the 103Rh NMR signal and to estimate the 103Rh T1 and T2 relaxation times as a function of field and temperature. The 103Rh longitudinal T1 relaxation in 103Rh(acac)3 is shown to be dominated by the spin-rotation mechanism, with an additional field-dependent contribution from the 103Rh chemical shift anisotropy.