Boron Ketoimine Fluorophores with Unique Optical Properties: Multicolor Tuning, Efficient Dual‐State Emission, and Reversible Acid‐Base Response

• DOI: 10.1002/adom.202301201
• Publication Date: 2023-08-28T02:54:33Z
• Authors: Dong Yang; Guangming Tian; Jianhua Ma; Xinhai He; Jie Kong
• Keywords: HOMO/LUMO; Triphenylamine; Acceptor; Planarity testing

Abstract Organic luminophores with high emission efficiency in solution as well solid‐state have received increasing attention due to their promising applications biosensors, biological imaging, and optoelectronic devices. Herein, four triphenylamine (TPA)‐substituted boron ketoimine molecules (TPA‐BKI a‐d) are designed synthesized by combining a donor‐acceptor (D‐A) electronic system highly twisted block. The asymmetry of molecular the planarity highest occupied orbital (HOMO) lowest unoccupied (LUMO) sides excited state endow TPA‐BKI a‐d rigidified conformations, allowing bright dilute solution. Additionally, structures avoid close contact between detrimental exciton interactions, leading efficient solid state. Meanwhile, colors modulated incorporation different substituents through amino‐yne click reaction. Furthermore, because protonation deprotonation amino substituents, TPA‐BKI‐d exhibits reversible alterations optical properties both states.