Peckus Domantas, Matulaitis Tomas, Franckevičius Marius, Mimaitė Viktorija, Tamulevičius Tomas, Simokaitienė Ju Ratė, Volyniuk Dmytro, Gulbinas Vidmantas, Tamulevičius Sigitas, Gražulevičius Juozas Vidas
Institute of Materials Science , Kaunas University of Technology , K. Baršausko Str. 59 , LT-51423 Kaunas , Lithuania.
Department of Polymer Chemistry and Technology , Kaunas University of Technology , Radvilėnų Rd. 19 , LT-50254 Kaunas , Lithuania.
J Phys Chem A. 2018 Mar 29;122(12):3218-3226. doi: 10.1021/acs.jpca.8b00981. Epub 2018 Mar 15.
Excited state dynamics of trinary star-shaped dendritic compounds with triphenylamine arms and different cores were studied by means of time-resolved fluorescence and transient absorption. Under optical excitation, nonpolar C symmetry molecules form polar excited states localized on one of the molecular substituents. Conformational excited state stabilization of molecules with an electron-accepting core causes a formation of twisted internal charge transfer (TICT) states in polar solvents. A low transition dipole moment from TICT state to the ground state causes very weak fluorescence of those compounds and strong dependence on the solvent polarity. The compound formed from the triphenylamine central core and identical arms also experiences excited state twisting, however, weakly sensitive to the solvent polarity.
通过时间分辨荧光和瞬态吸收研究了具有三苯胺臂和不同核心的三元星形树枝状化合物的激发态动力学。在光激发下，非极性C对称分子形成局域在分子取代基之一上的极性激发态。具有吸电子核心的分子的构象激发态稳定化导致在极性溶剂中形成扭曲的内电荷转移（TICT）态。从TICT态到基态的低跃迁偶极矩导致这些化合物的荧光非常弱，并且对溶剂极性有很强的依赖性。由三苯胺中心核和相同臂形成的化合物也经历激发态扭曲，然而，对溶剂极性不太敏感。
