Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
J Phys Chem B. 2021 Mar 11;125(9):2339-2350. doi: 10.1021/acs.jpcb.0c09705. Epub 2021 Mar 1.
A molecular photoswitch, 2-(4'-diethylamino-2'-hydroxyphenyl)-1-imidazo-[4,5-b]pyridine (DHP), with mutually independent paths of excited-state intramolecular proton transfer (ESIPT) and twisted intramolecular charge transfer (TICT) was developed. Control over these processes was attained by switching the solvents. Depending on the solvent's hydrogen-bond capacity and polarity, either one of the photoprocesses (ESIPT or TICT) or both can be triggered. Accordingly, normal and tautomer emissions, normal and TICT emissions, or triple emission of normal, tautomer, and TICT were obtained from the molecule. The emissions were resolved by fluorescence lifetime. The conclusions were established by synthesizing and studying the methoxy derivative of the molecule.
一种分子光开关，2-(4'-二乙氨基-2'-羟基苯基)-1-咪唑并[4,5-b]吡啶(DHP)，具有相互独立的激发态分子内质子转移(ESIPT)和扭曲分子内电荷转移(TICT)途径。通过切换溶剂可以控制这些过程。根据溶剂的氢键能力和极性，可以触发其中一种光过程(ESIPT 或 TICT)或两种光过程。因此，从该分子中获得了正常和互变异构体发射、正常和 TICT 发射或正常、互变异构体和 TICT 的三重发射。通过荧光寿命来解析发射。通过合成和研究该分子的甲氧基衍生物得出了结论。
