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Abstract
A new dye chemosensor molecule toward Hg2+ detection based on rhodamine 6G was synthesized by the condensation reaction of compound 2 and 2-amino-5,6-dimethyl-benzimidazole. Chemosensor 1 showed highly selective functions toward Hg2+ recognition with compared to other examined metal ions. The chemical structures of all the intermediates and chemosensor 1 were characterized by 1H NMR, Mass Spectrometer, and elemental analysis. Upon the addition of Hg2+, chemosensor 1 exhibited a remarkable emission change from colorless to green fluorescence. Additionally, the absorption color change from colorless to light pink in UV-vis range was observed. However, other metal ions such as Cu2+, Ag2+, Co2+, Pb2+, Zn2+, Fe3+, Fe2+, and Mg2+ did not accompany any noticeable spectral change.
Acknowledgment
This research was financially supported by the research fund of the Overseas Visiting Scholarship Program by the Office of the Vice President for International Affairs at Chungnam National University. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 20110022326).