Journal
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 30, Issue 1, Pages 32-36Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-014-3364-z
Keywords
Rhodamine 6G; Chemosensor; Cu2+; Hg2+
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Funding
- National Natural Science Foundation of China [21272172, 21074093, 21004044]
- Natural Science Foundation of Tianjin City, China [12JCZDJC21000]
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A novel water soluble chemosensor 1 based on rhodamine 6G spirolactam scaffold has been synthesized and characterized. Upon addition of a wide range of the environmentally and biologically relevant metal ions, chemosensor 1 shows a colorimetric selective Cu2+ recognition from colorless to pink confirmed by UV-Vis absorption spectral changes, while it also exhibits a fluorometric selective Hg2+ recognition by fluorescence spectrometry. An absorption enhancement factor over 17-fold with 1-Cu2+ complex and a fluorescent enhancement factor over 45-fold with 1-Hg2+ complex were observed. Their recognition mechanisms were assumed to be a 1:1 stoichiometry for 1-Cu2+ complex and a 1:2 stoichiometry for 1-Hg2+ complex, respectively, which were proposed to be different ligation leading to the ring-opening of rhodamine 6G spirolactam. Furthermore, the detection limits for Cu2+ or Hg2+ were 3.3x10(-8) or 1.7x10(-7) mol/L, respectively.
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