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- Title
Highly Fluorescent Bipyrrole‐Based Tetra‐BF<sub>2</sub> Flag‐Hinge Chromophores: Achieving Multicolor and Circularly Polarized Luminescence.
- Authors
Cui, Luxia; Shinjo, Hyuga; Ichiki, Takafumi; Deyama, Koichi; Harada, Takunori; Ishibashi, Kohei; Ehara, Takumi; Miyata, Kiyoshi; Onda, Ken; Hisaeda, Yoshio; Ono, Toshikazu
- Abstract
This study reports the facile syntheses of tetra‐boron difluoride (tetra‐BF2) complexes, flag‐hinge‐like molecules that exhibit intense green‐to‐orange luminescence in solution and yellow‐to‐red emission in the solid states. Single‐crystal structure analysis and density functional theory calculations suggested a bent structure of this series of compounds. The complexes also exhibited excellent optical properties, with quantum yields reaching 100 % and a large Stokes shift. These properties were attributed to the altered bending angle of the molecule in the S1 excited state. As the rotational motion was suppressed around the 2,2′‐bipyrrole axis, atropisomers with axial chirality were formed, which are optically resolvable into (R) and (S)‐enantiomers through a chiral column. The atropisomers thus function as circularly polarized luminescent (CPL) materials, in which the color (green, green‐yellow, and yellow) can be varied by controlling the aggregation state. This rational design of multi‐BF2 complexes can potentially realize novel photofunctional materials.
- Subjects
CHIRALITY element; CHROMOPHORES; ROTATIONAL motion; STOKES shift; DENSITY functional theory; INTRAMOLECULAR proton transfer reactions; LUMINESCENCE spectroscopy; LUMINESCENCE
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 27, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202204358