An efficient broadband decoupling sequence for liquid crystals.
A new and efficient broadband decoupling sequence is presented. It is based on the phase cycling of two pulses with small phase angles. The pulse width is 180 degrees +/- 30 degrees, and the phase angle is +/-10 degrees-12 degrees. The sequence contains 16 elements, and is called SPARC-16 as an abbreviation for small phase angle rapid cycling. The application of this sequence to a liquid crystalline compound, 4-n-pentyl-4'-cyanobiphenyl (5CB), is reported. The signal-to-noise ratios and the linewidths of the 13C peaks of 5CB with SPARC-16 decoupling and with other decoupling methods are compared. The results show that the broadband decoupling efficiency of SPARC-16 is considerably better than those of other methods.
Yu
Y
Y
Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019-0370, USA.
Fung
B M
BM
D003460:Crystallization; D019906:Nuclear Magnetic Resonance, Biomolecular; D015676:Osteonectin / Q000737:chemistry*; D011487:Protein Conformation; D012996:Solutions
D015676:Osteonectin; D012996:Solutions