Fused Isoindigo Ribbons with Absorption Bands Reaching Near-Infrared

Yu Jiang; Xiaohua Zheng; Yunfeng Deng; Hongkun Tian; Junqiao Ding; Zhigang Xie; Yanhou Geng; Fosong Wang

doi:10.1002/anie.201800512

Fused Isoindigo Ribbons with Absorption Bands Reaching Near-Infrared

Angew Chem Int Ed Engl. 2018 Aug 6;57(32):10283-10287. doi: 10.1002/anie.201800512. Epub 2018 Apr 23.

Authors

Yu Jiang^{1

2}, Xiaohua Zheng^{1

2}, Yunfeng Deng³, Hongkun Tian¹, Junqiao Ding¹, Zhigang Xie¹, Yanhou Geng^{1

3

4}, Fosong Wang¹

Affiliations

¹ State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
⁴ Tianjin Key Laboratory of Molecular Optoelectronic Science and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, P. R. China.

PMID: 29635885
DOI: 10.1002/anie.201800512

Abstract

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.

Keywords: NIR absorption; conjugation; dyes; fused isoindigo; photothermal properties.