(BO) ₂ ‐Doped Tetrathia[7]helicene: A Configurationally Stable Blue Emitter

A highly configurationally stable [4]heterohelicenium cation.

A boron-doped helicene as a highly soluble, benchtop-stable green emitter.

The high-yield synthesis of a boron-doped [4]helicene was achieved through a Ni-mediated Yamamoto C-C-coupling reaction; the moderate distortion of the molecular scaffold confers excellent solubility to the air- and water-stable green luminophore.

Configurationally stable propeller-like triarylphosphine and triarylphosphine oxide.

Configurationally stable, propeller-like triarylphosphine and triarylphosphine oxide can be synthesized; a chiral scaffold based on Lissoclinum-cyclopeptides linked via three peptide bonds with a triphenylphosphine and triphenylphosphine oxide moiety, respectively, prevents effectively epimerization at the chiral phosphorus atom.

Stereoselective synthesis of configurationally stable functionalized ethano-bridged Tröger bases.

New functionalized ethano-bridged Tröger bases are readily prepared using a simple alkylation/rearrangement sequence which affords configurationally stable derivatives as single stereoisomers (de > 96%).

Thermodynamically stable blue phases.

We show theoretically that flexoelectricity stabilizes blue phases in chiral liquid crystals. Induced internal polarization reduces the elastic energy cost of splay and bend deformations surrounding singular lines in the director field. The energy of regions of double twist is unchanged. This in turn reduces the free energy of the blue phase with respect to that of the chiral nematic phase, lea...