[討論] NMR
http://orgchem.colorado.edu/hndbksupport/nmrtheory/splitting.html
關於上次普化大家的疑問 為什麼同樣population的Hydrogen, spin不同 NMR看不到
跟貝殼討論的想法(其實都是他跟我講的..XD)是覺得
同樣population的Hydrogen spin不同的能階是存在的
但是為什麼看不到 是因為這些能階的躍遷是forbidden
詳細的在上面Colorado Univ.的網站裡
"Coupling is never observed between chemical shift equivalent nuclei,
be it from symmetry or by accident, not because the Bn field disappears
but because spin transitions that would reveal the coupling are forbidden
by symmetry. The role of symmetry in forbidding spectral transitions
is of general importance in spectroscopy but is beyond the scope of this
discussion. "
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