Spiraling into control: A photoresponsive supramolecular assembly demonstrates that light, along with heating (Δ) and cooling (), can cause chiral communication between molecules. This effect leads to bias in the helicity of the complex, causing a reversible switching of macroscopic handedness, as shown by a reversal of sign of the circularly polarized luminescence (CPL) that is emitted.

Higher-order super-helical structures derived from biological molecules are known to evolve through opposite coiling of the initial helical fibers, as seen in collagen protein. A similar phenomenon is observed in a π-system self-assembly of chiral oligo(phenyleneethylene) derivatives (S)-1 and (R)-1 that explains the unequal formation of both left- and right-handed helices from molecule having a specific chiral center. Concentration- and temperature-dependent circular dichroism (CD) and UV/Vis spectroscopic studies revealed that the initial formation of helical aggregates is in accordance with the molecular chirality. At the next level of hierarchical self-assembly, coiling of the fibers occurs with opposite handedness, thereby superseding the command of the molecular chirality. This was confirmed by solvent-dependent decoiling of super-helical structures and concentration-dependent morphological analysis.

Chirale Kommunikation zwischen Molekülen mithilfe von Licht, Wärmezufuhr (Δ) und Kühlung () wird an einem photoresponsiven supramolekularen Assoziat gezeigt. Dies führt zu einer Tendenz in der Helizität des Komplexes, was einen reversiblen Wechsel der makroskopischen Händigkeit zur Folge hat, wie die Vorzeichenumkehr der emittierten zirkular polarisierten Lumineszenz belegt.

Higher-order super-helical structures derived from biological molecules are knownt oe volve through opposite coiling of the initial helical fibers,asseen in collagen protein. A similar phenomenon is observed in a p-system self-assembly of chiral oligo(phenyleneethylene) derivatives (S)-1 and (R)-1 that explains the unequal formation of both left-and righthanded helices from molecule having as pecific chiral center. Concentration-and temperature-dependent circular dichroism (CD) and UV/Vis spectroscopic studies revealed that the initial formation of helical aggregates is in accordance with the molecular chirality.A tt he next level of hierarchical selfassembly,coiling of the fibers occurs with opposite handedness, therebys uperseding the command of the molecular chirality. This was confirmed by solvent-dependent decoiling of superhelical structures and concentration-dependent morphological analysis.