A Cyano-Substituted Organoboron Electron-deficient Building Block for D-A Type Conjugated Polymers

The development of donor-acceptor (D-A) type conjugated polymers depends largely on the design of novel A building blocks. Herein, we report a novel A building block based on the cyano-substituted organoboron unit ( SBN-3 ). Compared with the most common fluorine-substituted B←N unit, SBN-3 displays...

Full description

Saved in:
Bibliographic Details
Published in:Chinese journal of polymer science 2023-05, Vol.41 (5), p.832-838
Main Authors: Liu, Meng-Yu, Shao, Xing-Xin, Liu, Jun, Wang, Li-Xiang
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Cyano groups
Energy gap
Energy levels
Fluorine
Industrial Chemistry/Chemical Engineering
Infrared absorption
Molecular orbitals
Near infrared radiation
Polymer Sciences
Polymers
Research Article
Substitutes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of donor-acceptor (D-A) type conjugated polymers depends largely on the design of novel A building blocks. Herein, we report a novel A building block based on the cyano-substituted organoboron unit ( SBN-3 ). Compared with the most common fluorine-substituted B←N unit, SBN-3 displays a significantly downshifted LUMO energy level because of the strong electron-withdrawing ability of cyano groups. In addition, due to the greater impact of cyano substitution on LUMO than on HOMO, SBN-3 exhibits a reduced band gap, near-infrared absorption and fluorescence properties. The D-A type conjugated polymers based on the cyano-substituted B←N unit with thiophene-based units show narrow optical band gaps of ca. 1.3 eV as well as distinctive electronic structures, i.e. , delocalized LUMOs and localized HOMOs. This work thus provides not only an effective approach to design strong A units but also a new electron-deficient building block for D-A type conjugated polymers.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-023-2940-4