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- Title
4,7-Bis[3-(dimesitylboryl)thien-2-yl]benzothiadiazole: Solvato-, Thermo-, and Mechanochromism Based on the Reversible Formation of an Intramolecular B−N Bond.
- Authors
Shimogawa, Hiroyuki; Yoshikawa, Osamu; Aramaki, Yoshitaka; Murata, Michihisa; Wakamiya, Atsushi; Murata, Yasujiro
- Abstract
4,7-Bis-[3-(dimesitylboryl)thien-2-yl]benzothiadiazole ( 1) and monoborylated derivative 2 were synthesized and their chromic behavior was investigated. Photophysical measurements, single-crystal XRD analysis, and theoretical calculations revealed that an intramolecular B−N coordination bond formed reversibly. The equilibrium of this reversible bond formation depends on the solid-state structure, solvent, temperature, and mechanical forces, and leads to significant changes in the electronic structure and chromic behavior of these molecules. The responsiveness toward external stimuli, resulting in the reversible formation of open and closed forms of this system, is achieved through weak intramolecular B−N coordination bonds induced by the steric bulk of the mesityl groups on the boron centers.
- Subjects
HYDROGEN bonding; CHEMICAL synthesis; COMPUTATIONAL chemistry; INTRAMOLECULAR catalysis; X-ray powder diffraction
- Publication
Chemistry - A European Journal, 2017, Vol 23, Issue 15, p3784
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201606041