화학공학소재연구정보센터
Journal of Physical Chemistry, Vol.98, No.31, 7488-7491, 1994
Monochromatic Nuclear-Magnetic-Resonance Nutation Spectroscopy - Correlated Fluctuations of Dipolar Couplings and Anisotropic Chemical-Shifts in Aromatic Proton Systems
A new method to demonstrate the buildup of longitudinal two-spin order in an AX spin system on account of D-CSA cross-correlation is shown. Two-spin order 2I(2)AI(2)X is created by using trains of selective square pulses which nutate only one spin of a two-spin system. Moreover, it is demonstrated, by measuring different aromatic compounds, that aromatic protons are prone to show an anisotropic chemical shift-CSA-term-of roughly 4-8 ppm.