Using Bispyrene Fluorescence Probe for Determining the Multiple States of Organogel

Author:

Liang, Yong  Tang, Jun  Wang, Xiang  Zhao, Siqi  Luo, Ting  Shuai, Cijun  Jiang, Jinzhi  Cai, Jianfeng  Xu, Hai  

Journal:

CHEMISTRYSELECT

Issue Date:

2018

Abstract(summary):

A bispyrene fluorescence probe with the cavitand linkage (compound 1) was synthesized, which was proved to be a versatile platform due to the ability of adopting two spatially well-defined conformations: a closed vase and an expanded kite. vase-1 was switched to kite-1 upon addition of TFA or cooling, whereas kite-1 was isomerized to vase-1 in the presence of NEt3 or through heating. The interconversion in this molecular switch was tightly associated with the change of fluorescence as we found that changing the temperature and pH of the system- a bis pyrene compound 1 and gelator 2 led to the sol - gel transformation and reversible intramolecular excimer emission. Briefly, the results show that the fluorescence decreases in the gelation phase and is enhanced in the solution due to variations in temperature and pH. we thus concluded that 1 could be a useful fluorescence probe to determine the multiple states of organogel.

Page:

5361---5363