Luangphai S, Fongsiang J, Thuptimdang P, Buddhiranon S, Chanawanno K. Colorimetric Cu
2+ Detection of (1
E,2
E)-1,2-Bis((1
H-pyrrol-2-yl)methylene)hydrazine Using a Custom-Built Colorimeter.
ACS OMEGA 2022;
7:44448-44457. [PMID:
36506133 PMCID:
PMC9730750 DOI:
10.1021/acsomega.2c06751]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 11/10/2022] [Indexed: 06/17/2023]
Abstract
The compound (1E,2E)-1,2-bis((1H-pyrrol-2-yl)methylene)hydrazine (1) was investigated for its chemosensor application. The colorimetric response of 1 with various ions was investigated, and the selective optical change upon mixing with Cu2+ was found. The Cu2+ binding stoichiometry of 1 derived from Job's plot and the in silico study give us the tentative structural detail of the binding mode of 1 and Cu2+ being 1:1. The binding constant between 1 and Cu2+ from the Benesi-Hildebrand plot was 1.49 × 104 M-1. The limit of detection of 1 in Cu2+ detection was 0.64 μM (0.040 ppm), which is much lower than the WHO and US EPA maximum allowable Cu2+ level in drinking water (2 and 1.3 ppm, respectively). The custom-built colorimeter demonstrates a good linear relationship between Cu2+ concentration and electrical resistance (Ω) upon 1-Cu2+ ion binding.
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