A colorimetric squaraine-based probe and test paper for rapid naked eyes detection of copper ion (II)

• Published in: Tetrahedron letters Vol. 59; no. 44; pp. 3930 - 3933
• Main Authors: Liu, Yang, Wang, Liqiu, Guo, Chenxiao, Hou, Yajuan
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 31.10.2018; Elsevier
• Subjects: Chemistry; Chemistry, Organic; Colorimetric sensor; Copper ion; Naked eye detection; Physical Sciences; Science & Technology; Squaraine; Test paper; Test paper; Naked eye detection; Copper ion; Colorimetric sensor; Squaraine; CU2; FLUORESCENT; DYES; SENSOR
• ISSN: 0040-4039; 1873-3581
• DOI: 10.1016/j.tetlet.2018.09.042

A colorimetric sensor MOESQ based on squaraine was synthesized to detect Cu2+ in CH3CN with the detection limit of 1.88 × 10−7 molL−1. By adsorbing MOESQ on the chromatography paper, a colorimetric test paper for Cu2+ was prepared, which could detect Cu2+ with the color change from blue to faint yellow in the limit of detection concentration of 10−6 molL−1. [Display omitted] •N,N’-bis(2-methoxy-ethyl) squaraine with λabs and λem of 643 nm 653 nm in CH3CN.•A colorimetric squaraine probe for selective detection of Cu2+ ion in acetonitrile.•The squaraine-based test paper for rapidly and easily detecting Cu2+ by naked eyes.•Cu2+ detection limit 1.88 × 10−7 molL−1 in CH3CN and 10−6 molL−1 for the test paper. A colorimetric probe N,N’-bis(2-methoxy-ethyl)-2,3,3-trimethyl-3H-squaraine (MOESQ) with H2O solubility was synthesized to detect Cu2+. MOESQ exhibits good selectivity, high sensitivity and fast UV-Vis response toward Cu2+ over other competing ions in CH3CN. The detection limit of MOESQ for Cu2+ in CH3CN can reach 1.88 × 10−7 molL−1. By adsorbing MOESQ on the chromatography paper, a colorimetric test paper for Cu2+ was prepared, which could detect Cu2+ with the color change from blue to faint yellow even in the limit of detection concentration of 10−6 molL−1.