A simple technique for determining nuclear quadrupole coupling constants with RAPT solid-state NMR spectroscopy.
An enhanced Rotor Assisted Population Transfer (RAPT) experiment is presented and used as a simple and fast technique to measure the magnitude of the nuclear quadrupolar coupling constant of half-integer quadrupolar nuclei. The enhanced RAPT sequence consists of a train of Gaussian pulses with alternating off-resonant frequencies of +/-nuoff. Simulated and experimental results demonstrating the method are given in the case of 87Rb (spin 3/2) and 27Al (spin 5/2) nuclei. The RAPT sequence is also used to selectively suppress resonances based on their quadrupolar coupling constant.
Prasad
Subramanian
S
Department of Chemistry, Ohio State University, 120 West 18th Avenue, Columbus, Ohio 43210, USA.
Kwak
Hyung-Tae
HT
Clark
Ted
T
Grandinetti
Philip J
PJ