Abstract
A new bifunctional probe based on indole-isophorone conjugate for the distinct response of Hg2+ and F− ion was demonstrated for the first time. The sensing property of 3 with F− ion is due to the formation of H-bonds between F− ion and NH moiety which has been enhanced ICT between NH and isoporone unit. Sensing mechanism of Hg2+ has also been confirmed by competitive experiment. The association constant were found to be 5.89×104 and 1.15×104 M−1 for the 3-Hg2+ and 3-F−, respectively. Theoretical calculation was performed to explain the optical sensing property of 3 with Hg2+ and F− ion.
Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2014002985)