Four different hexahelicenes, 5-aza-hexahelicene, hexahelicene, 2-methyl-hexahelicene, and 2-bromo-hexahelicene, were prepared and their enantiomers, which are stable at r.t., were separated. Vibrational circular dichroism (VCD) spectra were measured for 5-aza-hexahelicene; 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). 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 5-aza-hexahelicene is also examined from this point of view.

Helical sense-responsive and substituent-sensitive features in vibrational and electronic circular dichroism, in circularly polarized luminescence, and in Raman spectra of some simple optically active hexahelicenes

FONTANA, Francesca;TORRICELLI, Franck;CARONNA, Tullio;
2014-01-01

Abstract

Four different hexahelicenes, 5-aza-hexahelicene, hexahelicene, 2-methyl-hexahelicene, and 2-bromo-hexahelicene, were prepared and their enantiomers, which are stable at r.t., were separated. Vibrational circular dichroism (VCD) spectra were measured for 5-aza-hexahelicene; 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). 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 5-aza-hexahelicene is also examined from this point of view.
journal article - articolo
2014
Abbate, Sergio; Longhi, Giovanna; Lebon, France; Castiglioni, Ettore; Superchi, Stefano; Pisani, Laura; Fontana, Francesca; Torricelli, Franck; Caronna, Tullio Giuseppe Maria; Villani, Claudio; Sabia, Rocchina; Tommasini, Matteo; Lucotti, Andrea; Mendola, Daniele; Mele, Andrea; Lightner, DAVID A.
File allegato/i alla scheda:
File Dimensione del file Formato  
JPhysChemC2014.pdf

Solo gestori di archivio

Descrizione: publisher's version - versione dell'editore
Dimensione del file 2.38 MB
Formato Adobe PDF
2.38 MB Adobe PDF   Visualizza/Apri
Pubblicazioni consigliate

Aisberg ©2008 Servizi bibliotecari, Università degli studi di Bergamo | Terms of use/Condizioni di utilizzo

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/31167
Citazioni
  • Scopus 124
  • ???jsp.display-item.citation.isi??? 123
social impact