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Fused Isoindigo Ribbons with Absorption Bands Reaching Near‐Infrared
Author(s) -
Jiang Yu,
Zheng Xiaohua,
Deng Yunfeng,
Tian Hongkun,
Ding Junqiao,
Xie Zhigang,
Geng Yanhou,
Wang Fosong
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201800512
Subject(s) - absorption (acoustics) , ribbon , photothermal therapy , molecule , conjugated system , infrared , materials science , absorption band , laser , near infrared spectroscopy , irradiation , photochemistry , chemistry , optoelectronics , polymer , nanotechnology , optics , organic chemistry , physics , nuclear physics , composite material
Through fusing isoindigo (IID) units at 6,7;6′,7′‐positions, a series of new near‐infrared (NIR) absorbing and stable ribbon‐like conjugated molecules, namely nIIDs in which n represents the number of IID units, have been synthesized. The optical band gaps of the molecules are lowered from 2.03 eV of 1IID to 1.12 eV of 6IID with the increase of the conjugation length. 3IID, 4IID, and 6IID have strong absorption in the NIR region and exhibit photothermal conversion efficiencies of greater than 50 % under laser irradiation at λ =808 nm.