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Two recently proposed 13C–13C recoupling methods under magic angle spinning (MAS), resonant interference recoupling (RIR), and 13C–1H dipolar-assisted rotational resonance (DARR), are examined on a common theoretical foundation using the average Hamiltonian theory. In both methods, a rf field is applied on not 13C but 1H to recouple the 13C–1H dipolar interactions, and spectral overlap necessary to conserve energy for 13C–13C polarization transfer is achieved by the 13C–1H dipolar line broadening. While DARR employs time-independent 13C–1H interactions recoupled by suitable rf irradiation to 1H spins, RIR uses time-dependent 13C–1H interactions modulated appropriately by 1H rf irradiation. There are two distinct cases where 13C–1H line broadening realizes 13C–13C spectral overlap. For a pair of a carbonyl or aromatic carbon and an aliphatic carbon, spectral overlap can be achieved between one of the spinning sidebands of the former 13C resonance and the 13C–1H dipolar powder pattern of the latter. On the ...

C 13 – 1 H dipolar-driven C13–13C recoupling without C13 rf irradiation in nuclear magnetic resonance of rotating solids