Control of excited state conformation in B,N‐acenes

Herein we show a new concept to control conformation in molecules in the excited state through harvesting negative hyperconjugation. The strategy was realized with the 2,3,1,4‐benzodiazadiborinane scaffold that was prepared by a new synthetic protocol. Photochemical studies identify dual light emission that can be assigned to originate from well‐defined conformers. The emission at longer wavelength can be switched off by restricting the rotational degrees of freedom in the solid‐state as well as by controlling the energy level of the excited states through solvent polarity.

from A via a.sfakia on Inoreader http://bit.ly/2ARQDLX