Dithia[9]helicenes: Molecular design, surface imaging, and circularly polarized luminescence with enhanced dissymmetry factors

Abstract

We have carried out the synthesis of two dithia[9]helicenes by means of a LED-based double photocyclization. The compounds have sulfur atoms placed at the terminal rings of the helicene, and...

The effect of axial and helical chirality on circularly polarized luminescence: lessons learned from tethered twistacenes

“…11 The nature of the substituents also has substantial effects when using a helicene scaffold. 12,13 Several works highlighted the effect of extended conjugation of the dissymmetry factor. 14 The addition of substituents on various position of an intrinsically-chiral backbone was also reported to increase g lum .…”

Chiral H‐aggregation‐induced large stokes shift with CPL generation assisted by α‐helical poly(L‐lysine) substructure

“…As a chiroptical light source, CPL represents one of the most recent periods of technological advancement in optical science. Various CPL generation compounds with precise molecular designs have been produced in the last decade 42–49 . However, these approaches combine elements both of fluorescence and chirality into a single molecule, resulting in a lengthy and complex synthetic pathway and purifying process.…”

“…Various CPL generation compounds with precise molecular designs have been produced in the last decade. [42][43][44][45][46][47][48][49] However, these approaches combine elements both of fluorescence and chirality into a single molecule, resulting in a lengthy and complex synthetic pathway and purifying process. To solve this issue, a new way of combining nonchiral fluorescent agents with a chiral template has been proposed and developed.…”

Negative solvatochromism and sign inversion of circularly polarized luminescence in chiral exciplexes as a function of solvent polarity

“…For all spectra, a global shift of À0.40 eV was applied to the calculated excitation energies prior to their conversion to wavelengths. RSH functionals such as the one used in this work are known to overestimate experimental excitation energies for systems of the type studied herein, [39][40][41][42] and therefore the shift was required to align the experimental and calculated spectral bands. In addition, the vertical gradient (VG) approximation used to model the emission spectra is known to require a shift to align with experimental band positions.…”