%0 Journal Article
%T A Naphthalimide-Benzothiazole Conjugate as Colorimetric and Fluorescent Sensor for Selective Trinitrophenol Detection
%J Chemosensors | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/chemosensors7030038
%X Although chemical structural modification of naphthalimides is widely employed for the purpose of sensing explosives, the effects of such modification have been little explored. Herein, we report the design and synthesis of a new naphthalimide-benzothiazole conjugate ( 1) and its ability to sense various nitrophenols by means of its colorimetric and fluorescent characteristics. Under long-range UV light (365 nm), 1 displayed a color change of its solution from bluish to colorless only upon addition of 2,4,6-trinitrophenol (TNP). Photoluminescence spectroscopy showed quantitative fluorescence quenching by TNP of the emission peaks of 1 at 398 nm and 418 nm due to donor¨Cacceptor electron transfer. The interaction of 1 with TNP was via a cooperative, non-covalent hydrogen-bonding interaction. Receptor 1 exhibited high sensitivity and selectivity towards TNP over various aromatic nitro analytes. The binding constant (K) and Stern¨CVolmer constant ( K sv) between 1 and TNP were found to be 5.332 ¡Á 10 £¿5 M and 2.271 ¡Á 10 6 M £¿1, respectively. Furthermore, the limit of detection was calculated and found to be as low as 1.613 ¡Á 10 £¿10 M. View Full-Tex
%U https://www.mdpi.com/2227-9040/7/3/38