Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 3, Pages 1682-1695Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp4105695
Keywords
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Funding
- Italian MIUR
- FIRB program [RBFR08XH0H]
- CARIPLO foundation
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Four different hexahelicenes, 5-aza-hexahelicene (1), hexahelicene (2), 2-methyl-hexahelicene (3), and 2-bromo-hexahelicene (4), were prepared and their enantiomers, which are stable at r.t., were separated. Vibrational circular dichroism (VCD) spectra were measured for compound 1; for all the compounds, electronic circular dichroism (ECD) and circularly polarized luminescence (CPL) spectra were recorded. Each type of experimental spectrum was compared with the corresponding theoretical spectrum, determined via Density Functional Theory (DFT). Following the recent papers by Nakai et al., this comparison allowed to identify some features related to the helicity and some other features typical of the substituent groups on the helical backbone. The Raman spectrum of compound 1 is also examined from this point of view.
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