首页|Effects of azole rings with different chalcogen atoms on ESIPT behavior for benzochalcogenazolyl-substituted hydroxyfluorenes

Effects of azole rings with different chalcogen atoms on ESIPT behavior for benzochalcogenazolyl-substituted hydroxyfluorenes

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  • NSTL
  • Elsevier
ESIPT behavior has attracted a lot of eyes of researchers in recent years because of its unique optical properties. Due to its large Stokes shift and double emission fluorescence, white light can be generated in the fluorophore based on the excited state intramolecular proton transfer (ESIPT) principle. The excited state proton transfer behavior of hydroxylated benzoxazole (BO-OH), benzothiazole (BS-OH) and benzoselenazole (BSe-OH) have been investigated in heptane, chloroform and DMF solvents. By comparing the infrared vibration spectra and the variation of bond parameters from the S-0 to S-1 states, and analyzing the frontier molecular orbitals, the influence of hydrogen bond dynamics, the solvent polarity, charge redistribution and the effects of different proton acceptors on proton transfer were observed. The only structural difference among the three substituted hydroxyfluorenes is the heteroatom in the azole ring (oxygen, sulfur and selenium, respectively). We have scanned the potential energy curve of the ESIPT process, and compared the potential barrier, it is found that the heavier chalcogen atoms are more favorable for proton transfer. At the same time, the potential application of changing heteroatoms in the azole ring by walking down the chalcogenic group in crystal luminescence color regulation is also discussed. (C) 2021 Elsevier B.V. All rights reserved.

Excited state proton transferIntramolecular hydrogen bondPotential energy curveChalcogen atomsEmission color-tunable chromophoresINTRAMOLECULAR PROTON-TRANSFERHYDROGEN-BONDTRANSFER MECHANISMSOLVENTPROBEDERIVATIVESINSIGHTSDYNAMICSDEVICESSINGLE

Song, Liying、Meng, Xuan、Zhao, Jinfeng、Han, Haiyun、Zheng, Daoyuan

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Shandong Univ

Peoples Hosp Dingtao Dist

2022

10.1016/j.saa.2021.120296

Spectrochimica acta

Spectrochimica acta

ISSN：1386-1425
年,卷(期)：2022.264
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