Both visual and fluorescent sensors for Zn2 + based on bis(pyrrol-2-yl-methyleneamine) platform.

Two bis(pyrrol-2-yl-methyleneamine) chemo-sensors, 1, 3- and 1, 4-bis[3,4-dimethyl-5-ethyloxy -carbonyl-pyrrol-2-yl-methyleneamine]benzene (H 2 L 1 and H 2 L 2 , respectively) have been synthesized and characterized, which exhibit high selectivity as off-on fluorescence sensors toward Zn 2 + in CH 3 CN/H 2 O (9:1, v /v) solution. The detection limits of both sensors are at the parts per million level. Moreover, the probes H 2 L 1 and H 2 L 2 could sense Zn 2 + by “naked eye” with a color change from colorless to yellow, and from yellow to dark yellow, respectively. To test the practical use of the probes, the determination of Zn 2 + in real water samples was also evaluated. [ABSTRACT FROM AUTHOR]