Journal ArticleDOI
Fluorescence of the higher helicenes
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TLDR
The fluorescence spectra, quantum yields and lifetimes of [10, [11]-, [12], [13], [14]-helicene and 3,15-ethanoheptahelicenes have been observed in 1,4-dioxan solution at room temperature as mentioned in this paper.About:
This article is published in Chemical Physics Letters.The article was published on 1976-10-01. It has received 85 citations till now. The article focuses on the topics: Intersystem crossing.read more
Citations
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Chiroptical Properties of Symmetric Double, Triple, and Multiple Helicenes.
TL;DR: In this paper, a review of the chemistry of multiple helicenes from the viewpoint of chiroptical properties is presented, highlighting the impact of the molecular symmetry on the chiroptic responses.
Journal ArticleDOI
Hexa-peri-hexabenzo[7]helicene: Homogeneously π-Extended Helicene as a Primary Substructure of Helically Twisted Chiral Graphenes
TL;DR: The femtosecond transient absorption spectroscopy revealed the ultrafast excited-state dynamics of the helical nanographene molecule, with a lifetime of only few picoseconds in the lowest-energy excited (S1) state.
Journal ArticleDOI
Symmetry-based rational design for boosting chiroptical responses
TL;DR: In this article, a general protocol for rationally aligning multiple chiral units to boost the chiroptical responses, using hexahelicene as a prototype, was proposed.
Journal ArticleDOI
Chiral Nanographene Propeller Embedding Six Enantiomerically Stable [5]Helicene Units
Veronika Berezhnaia,Myriam Roy,Nicolas Vanthuyne,Marco Villa,Jean-Valère Naubron,Jean Rodriguez,Yoann Coquerel,Marc Gingras +7 more
TL;DR: A one-step synthesis of a nanographene propeller with a D3-symmetry was obtained starting from 7,8-dibromo[5]helicene by Yamamoto nickel(0) couplings, which afforded a chiral polyaromatic hydrocarbon (PAH) embedding six enantiomerically stable [5] helicene units.
References
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Journal ArticleDOI
Intersystem crossing in the helicenes
M. Sapir,E. Vander Donckt +1 more
TL;DR: In this article, the rate constants of radiationless S1 → Tn and T1 → S0 intersystem crossing of six helicenes have been evaluated by combining emission lifetimes and quantum yields of fluorescence and triplet state formation.
Journal ArticleDOI
Fluorescence of the helicenes
TL;DR: In this paper, the fluorescence spectra, quantum efficiencies and lifetimes of hexa-, hepta-, octa-and nona-helicene were observed in 1,4-dioxan solution.
Journal ArticleDOI
Fluorescence lifetimes and relative quantum yields of 9,10-diphenylanthracene in dilute solutions of cyclohexane and benzene
D.J.S. Birch,R.E. Imhof +1 more
TL;DR: In this paper, the lifetimes of 9,10-diphenylanthracene in dilute solutions of cyclohexane and benzene at 25°C have been found to be 7.58 ± 0.04 and 6.95 ± 1.04 ns respectively.
Journal ArticleDOI
Room temperature phosphorescence of aromatics in fluid dimethylmercury
TL;DR: In this article, the use of a spin-forbidden transition enhancer as dimethylmercury allows one to measure phosphorescence spectra in a fluid medium at room temperature.
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