Finely Controlled Circularly Polarized Luminescence of a Mechano‐Responsive Supramolecular Polymer. Issue 52 (6th November 2019)

• Record Type: Journal Article
• Authors: Lee, Seonae; Kim, Ka Young; Jung, Sung Ho; Lee, Ji Ha; Yamada, Mihoko; Sethy, Ramarani; Kawai, Tsuyoshi; Jung, Jong Hwa
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 52(2019)
• Page Start: 18878
• Page End: 18882
• Publication Date: 2019-11-06
• Subjects: AIE effect -- circularly polarized luminescence -- helicity -- mechano-responsive materials -- supramolecular polymerization; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201911380
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Finely controlled circularly polarized luminescence (CPL) supramolecular polymerization based on a tetraphenylethene core with four l ‐ or d ‐alanine branch side chains (l ‐1 and d ‐1 ) in the solution state is presented, resulting from the tuning of mechanical stimulus. Weak, green emissions of l ‐1 and d ‐1 in tetrahydrofuran (THF) were converted into strong blue emissions by tuning the mechanical stimulus. The strong blue emissions were caused by an aggregation‐induced emission (AIE) effect during the formation of a supramolecular polymer. Lag time in the supramolecular polymerization was drastically reduced by the mechanical stimulus, which was indicative of the acceleration of the supramolecular polymerization. A significant enhancement of circular dichroism (CD) and CPL signals of l ‐1 and d ‐1 was observed by tuning the rotational speed of the mechanical stimulus, implying that the chiral supramolecular polymerization was accelerated by the mechanical stimulus. Abstract : Chiral supramolecular polymerization is controlled, resulting from the tuning of mechanical stimulus. Weak, green emissions were converted into strong blue emissions by tuning the mechanical stimulus. The strong blue emissions were caused by an aggregation‐induced emission (AIE) effect during the formation of a supramolecular polymer.