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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Selective azo dye-based colorimetric chemosensor for F-, CH3COO- and PO43-

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Author(s):
dos Santos, Caio Henrique [1] ; Uchiyama, Natan M. [1] ; Bagatin, Izilda A. [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Dept Quim, Lab Quim Calixarenos Espect Mol & Catalise, Rua Prof Arthur Riedel 275, BR-09972270 Diadema, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 210, p. 355-361, MAR 5 2019.
Web of Science Citations: 4
Abstract

Developing anionic receptors is a huge challenge, especially those using hydrogen bonds to interact with the analytes. Azobenzene-derivative selective chemosensor has been evaluated for anion recognition properties. 2-(4-Hydroxiazobenzene)benzoic acid (HABA) has two hydrogens groups available for interaction; one is the phenol group and the other is the carboxylic acid group, enabling interaction with cations and anions. Subsequently titrations of chromophore 2-(4-hydroxiazobenzene) benzoic add were performed with cations and anions; however, only the interactions with fluoride, acetate, and phosphate were significant. These data demonstrated the sensitivity of the ligand HABA by these anions, characterized by the displacement of the absorbance bands at 372 nm to 491 nm in acetonitrile. The association constants found to fluoride, acetate, and phosphate were 1.56 x 10(4) +/- 028, 1.25 x 10(4) +/- 0.60, and 1.90 x 10(4) +/- 0.67 mol(-1) dm(3) respectively. H-1 NMR titrations data confirmed association constants values in agreement with those of UV-Vis, besides showing evidence of the analyte interaction by the hydrogen-bonding of the carboxylic add group. Overall, UV-Vis limit of detection data for fluoride (1.05 x 10(-7) mol dm(-3)), acetate (3.77 x 10(-8) mol dm(-3)) and phosphate (3.00 x 10(-8) mol dm(-3)), support that HABA can detect low concentration of these anions. (C) 2018 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 15/20485-4 - Calixarenes and iminic ligands developed for sensors, luminescent and bioinorganic compounds
Grantee:Izilda Aparecida Bagatin
Support Opportunities: Regular Research Grants