A Highly Selective and Sensitive Colorimetric Probe for Cu2+ Determination in Aqueous Media Based on Derivative of Tryptanthrin

• Published in: Analytical Sciences Vol. 34; no. 10; pp. 1111 - 1115
• Main Authors: LIANG, Yawei, WANG, Xinna, FANG, Huanle, HAN, Ningjuan, WANG, Cuiling, XIAO, Zhiqiang, ZHU, Aihua, LIU, Jianli
• Format: Journal Article
• Language: English
• Published: Singapore The Japan Society for Analytical Chemistry 10-10-2018; Springer Nature Singapore; Japan Science and Technology Agency
• Subjects: Analytical Chemistry; Aqueous solutions; Buffer solutions; Chemistry; colorimetric probe; Colorimetry; Copper; cupric determination; Metal ions; Selectivity; Stoichiometry; Tryptanthrin derivative; cupric determination; Tryptanthrin derivative; colorimetric probe
• ISSN: 0910-6340; 1348-2246
• DOI: 10.2116/analsci.18P091

A new colorimetric probe, based on tryptanthrin derivative (TR-A), has been successfully synthesized. The probe shows good selectivity and sensitivity for Cu2+ over 12 competing metal ions in a 10 mM Tris–HCl buffer solution (pH 5.5). A significant peak at 623nm appears in the UV-Vis absorption of TR-A-Cu2+, and a noteworthy color change is observed with the naked eye from aquamarine blue to light orange. The interaction of TR-A and Cu2+ are proven to form a 1:1 binding stoichiometry; this identifying is expected to be completed within 1 min. The probe with a limit of detection (16 nM, R2 = 0.9934) shows excellent potential to determine Cu2+ in analysis systems.