A novel fluorescein-based colorimetric probe for Cu2+ detection. Issue 64 (21st June 2016)

• Record Type: Journal Article
• Authors: Wu, Xin; Gong, Xiaojuan; Dong, Wenjuan; Ma, Jun; Chao, Jianbin; Li, Chenzhong; Wang, Li; Dong, Chuan
• Is Part Of: RSC advances. Volume 6:Issue 64(2016)
• Page Start: 59677
• Page End: 59683
• Publication Date: 2016-06-21
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra07236d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A new colorimetric probe, 5-chlorosalicylaldehyde fluorescein hydrazone (CSFH), has been synthesized and characterized by, FT-IR, NMR, mass elemental analysis and X-ray single crystal diffraction. Abstract : A new colorimetric probe, 5-chlorosalicylaldehyde fluorescein hydrazone (CSFH), has been synthesized and characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, mass spectrometry, elemental analysis and X-ray single crystal diffraction. CSFH had nearly no absorption in visible region. In the presence of copper(ii ) ion a rapid color changes from colorless to yellow along with an obvious new absorption band appeared at 495 nm. CSFH was highly selective to Cu 2+ only in the aqueous solution, instead of common metal ions. The absorbance intensity and the color of CSFH solution increased gradually with the increase of Cu 2+ concentration. Common metal ions did not show any interference on the determination of Cu 2+ . The chemical stoichiometric ratio between the CSFH and Cu 2+ was 1 : 1 and corresponding association constant was 6.85 × 10 5 L mol −1, and the linear range for Cu 2+ detection was 0.25–14 μmol L −1 . The detection limits were 0.25 μmol L −1 and 1.0 μmol L −1 of Cu 2+ using the UV-Vis changes and the visual color changes by the naked eye respectively. The proposed method was applied to the determination of Cu 2+ in drinking water samples and the recoveries were 96–106%. The preparation of CSFH exhibited the quick, simple and facile advantages. The results showed that CSFH can be a good candidate for simple, rapid and sensitive colorimetric detection of Cu 2+ in aqueous solution.