Excimer-origin CPL <i>vs.</i> monomer-origin magnetic CPL in photo-excited chiral binaphthyl-ester-pyrenes: critical role of ester direction
Hana Okada, Nobuyuki Hara, Daiki Kaji, Motohiro Shizuma, Michiya Fujuiki, Yoshitane Imai
Abstract
Two chiral binaphthyl (BNp) derivatives bearing oppositely oriented ester linkers to two pyrene (Py) moieties [(R)/(S)-1 and (R)/(S)-2] enabled Py-origin circularly polarized luminescence (CPL), magnetic CPL (MCPL), and circular dichroism (CD). (R)-1 that exhibited (-)-sign CD showed (+)-sign Py-excimer CPL but did not exhibit MCPL. Conversely, (R)-2, with (-)-sign CD, did not show excimer-origin CPL, but exhibited clear Py-monomer MCPL.
Topics & Concepts
ExcimerMonomerExcited stateChemistryPhotochemistryMaterials sciencePolymer chemistryOrganic chemistryPhysicsFluorescenceOpticsPolymerAtomic physicsSynthesis and Properties of Aromatic CompoundsAxial and Atropisomeric Chirality SynthesisPhotochromic and Fluorescence Chemistry