Theoretical and experimental studies of circular dichroism of mono- and diazonia[6]helicenes.
作者： Yoshito Nakai , Tadashi Mori , Kiyoshi Sato , Yoshihisa Inoue
DOI: 10.1021/JP403426W
关键词: Stereochemistry 、 Crystallography 、 Circular dichroism 、 Protonation 、 Chemistry 、 Steric effects 、 Helicene 、 Chirality (chemistry) 、 Excitation
摘要: Combined experimental and theoretical studies revealed the characteristic circular dichroism (CD) spectral profiles of mono- diazonia[6]helicenes, which were distinctly different from those reported for parent [6]helicene neutral (di)aza-analogues. Aza[6]helicenes showed bisignate Cotton effects (CEs) at 1Ba 1Bb bands, along with a weak CE 1Lb band, where signs former bands are responsible helical chirality helicenes while sign latter is susceptive to various factors such as electronic steric effects. Protonation monoaza[6]helicenes produces azonia[6]helicenes, showing dramatic changes in pattern two three positive, negative extremum series comparable magnitudes, dual protonation diaza[6]helicenes forming diazonia[6]helicenes led only nominal (slightly rotational strength excitation energy) pattern. Such rather complicated contrasti...
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