Reconsider the fluorescence properties of 5-ASA and its sensing mechanism for iodide ion.

Author(s) Liu, L.; Sun, B.; Pen, J.; Mao, Y.; Ding, R.
Journal Spectrochim Acta A Mol Biomol Spectrosc
Date Published 2019 Jul 08
Abstract

5-ASA shows multiple fluorescence peaks at 408 nm, 480 nm and 500 nm in methanol solution, which can serve as ratiometric sensor for I. However, fluorescence mechanism of 5-ASA remains controversial and I detecting mechanism is unclear. With the aid of density functional theory and time-dependent density functional theory, this paper has carried out detailed investigations on both aspects at the molecular level. The origins of all the fluorescence peaks of 5-ASA have been assigned and a new fluorescence mechanism is proposed, which is convincing and intrinsically different from previously proposed mechanisms. Based on the new fluorescence mechanism, the I detecting mechanism is fully addressed. Two I detecting mechanisms have been proposed and are likely to coexist which lead to the sensitive detection of I.

DOI 10.1016/j.saa.2019.117369
ISSN 1873-3557
Citation Liu L, Sun B, Pen J, Mao Y, Ding R. Reconsider the fluorescence properties of 5-ASA and its sensing mechanism for iodide ion. Spectrochim Acta A Mol Biomol Spectrosc. 2019;223:117369.

Related Applications, Forms & Industries