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Preparation of a Multicarbazole‐Based Nanocapsule Capable of Largely Modulating Guest Spectroscopic Properties in Water
Author(s) -
Kudo Kohi,
Ide Tomohito,
Kishida Natsuki,
Yoshizawa Michito
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202102043
Subject(s) - carbazole , amphiphile , photochemistry , aggregation induced emission , boron , chemistry , monomer , excimer , absorption spectroscopy , electrochemistry , fluorescence , chemical engineering , nanotechnology , materials science , copolymer , polymer , organic chemistry , physics , engineering , electrode , quantum mechanics
A nanocapsule composed of multiple carbazole panels (ca. 12 panels) was quantitatively generated from bent carbazole‐based amphiphiles in water. Unlike previously reported macrocycles and coordination cages bearing several carbazole panels, the resultant nanocapsule displays enhanced emissivity and improved electrochemical stability as compared with the monomeric amphiphile. The spectroscopic properties of substituted coumarin and boron‐dipyrromethene dyes can be modulated upon encapsulation by the nanocapsule in water. In the cavity, a highly blue‐shifted absorption band is observed from largely twisted coumarin dyes and two absorption bands are found from boron‐dipyrromethene dimers stacked in an unusual L‐shaped fashion. Moreover, the encapsulated dimers exhibit unique excimer‐like emission.