Hexahydrohexahelicene—a non-planar composite molecule with highly resolved electronic spectra in a frozen n-alkane matrix

Identification of geochemical polycyclic aromatic hydrocarbons from terpenes by high-resolution Shpol'skii effect fluorescence spectrometry

“…The presence of the ethylcyclopenteno part of the chrys-a molecule apparently does not hinder the inclusion at low concentration (i.e., C < 6 M) of the solute in the re-heptane crystal in sites that are sufficiently homogeneous to give rise to high-resolution spectra. It should be mentioned that another large compound with unusual structure such as hexahydrohexahelicene, a nonplanar composite molecule, was also shown to give a Shpol'skii effect (3).…”

“…Flame optogalvanic spectrometry or laser-enhanced ionization (LEI) spectrometry has already been demonstrated (2-5) to be a very powerful technique in the trace analysis field. Different theoretical aspects of optogalvanic signals in flames (photoexcitation, charge production, and current detection) have been investigated in recent papers (3,(5)(6)(7)(8). In a conventional air-acetylene flame with low concentration of Na (100 ppb) and a two-step laser excitation, we have observed the temporal shapes of the LEI signal, using a fast current detector.…”

Helicenes at Air/Water Interface: Spreading Film and Metal Ion Induced a Helical Ring Nanostructure

“…The helicenes have been extensively applied in various fields, such as molecular machines, chiral recognition, asymmetric catalysis, and dye materials . Hydrohelicenes possess π-conjugated structure, flexible skeletons, and helical chirality, which lead to specific chiroptical and photophysical properties. − Owing to these outstanding properties, hydrohelicenes exhibit extensive potential applications in cell fluorescent imaging, switchable organic dye, organic optical waveguides, fluorescent sensing, and full-color emission dye . Due to the unique molecular structure, it is interesting to see how the hydrohelicenes behave and stack in a two-dimensional air/liquid interface.…”