Determination of Long-Range Dipolar Couplings Using Mono-Deuterated Liquid Crystals
作者:Cécile Canlet、B. M. Fung
DOI:10.1021/jp000509g
日期:2000.7.1
1H−2H dipolar coupling. Besides the information obtained from the 1D spectra, one-bond and two-bond 1H−13C dipolar coupling constants of 4‘-cyanobiphenyl hexanoate were determined using the method of proton encoded local field (PELF) spectroscopy in combination with off-magic-angle spinning (OMAS). The order parameters were calculated from the 2D spectra, and some of the coupling constants are compared
提出了一种测定液晶中长程偶极耦合的新方法。该策略是使用单氘代化合物来观察 13C NMR 光谱中的 2H-13C 分裂。例如,H-C 偶极耦合常数是从 4'-氰基联苯 2-氘代和 6-氘代己酸酯在整个向列范围内的光谱中获得的。此外,这些化合物的 1H-1H 偶极去耦的 2H NMR 光谱显示四极分裂和 1H-2H 偶极耦合。除了从一维光谱中获得的信息外,还使用质子编码局部场 (PELF) 光谱法结合偏魔角测定了 4'-氰基联苯己酸酯的单键和双键 1H-13C 偶极耦合常数纺纱(OMAS)。从二维光谱计算有序参数,