An ultrasensitive and selective "off-on" rhodamine-based colorimetric and fluorescent chemodosimeter for the detection of Cu2+

作者：Wang, Xiaochun^*; Tao, Jing; Chen, Xinqi^*; Yang, Hao

来源：Sensors and Actuators B: Chemical , 2017, 244: 709-716.

DOI：10.1016/j.snb.2017.01.040

• Chemodosimeter
• Rhodamine B
• Copper salts
• Off-on
• Naked-eye

A novel "off-on" colorimetric and fluorescent chemodosimeter, N-(2,4-dinitrophenyl) rhodamine B-hydrazide (DNPRH), has been designed and synthesized via integrating 2,4-dinitrophenylhydrazine with rhodamine B acid chloride, which can selectively detect the presence of Cu2+ with about 500-fold enhancement in fluorescence emission intensity at 578 nm over various environmentally relevant metal cations such as K+, Na+, Ag+, Mg2+, Ca2+, Al3+, Pb2+, Zn2+, Cd2+, Hg2+, Ni2+, Cr3+, Fe2+ and Fe3+ in pH 7.0 media. The significant change in color of DNPRH solution from colorless to pink induced by the addition of Cu2+ makes the "naked-eye" recognition of copper ion possible. In addition, the ultrasensitive detection limit for Cu2+ on the UV-vis and fluorescence measurement is down to 2.6 x 10(-8) mol L-1 and 1.2 x 10(-9) mol L-1, respectively.

• 出版日期2017-6
• 单位中国地质大学（北京）; 鞍山师范学院; 国家地质实验测试中心; 中国人民解放军防化研究院第六研究所