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Optical Detection of Bromide Ions Using Pt(II)-5,10,15,20-Tetra-(4-methoxy-phenyl)-porphyrin

1
Institute of Chemistry “Coriolan Dragulescu”, Mihai Viteazu Ave. No. 24, 300223 Timisoara, Romania
2
National Institute for Research and Development in Electrochemistry and Condensed Matter, P. Andronescu Street, No. 1, 300224 Timisoara, Romania
3
Faculty of Chemistry, Biology, Geography, West University of Timisoara, 4 V. Parvan Ave, 300223 Timisoara, Timis, Romania
*
Author to whom correspondence should be addressed.
Chemosensors 2019, 7(2), 21; https://doi.org/10.3390/chemosensors7020021
Received: 29 March 2019 / Revised: 23 April 2019 / Accepted: 23 April 2019 / Published: 27 April 2019
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Abstract

Bromide ions are present in many environments, such as sedative drugs, methyl-bromide-treated vegetables and seawater. Excess bromide in humans interferes with iodide metabolism and is considered toxic. The need for fast and inexpensive methods for bromide detection is of interest. Spectrophotometric detection methods provide accurate and sensitive results. The well-known ability of metalloporphyrins to bind anionic ligands to the central metal ion has been exploited. The changes in the optical properties of Pt(II) 5,10,15,20-tetra(4-methoxy-phenyl)-porphyrin (PtTMeOPP) under the influence of bromide ions allowed us to achieve a fast, simple and reliable UV-vis spectrophotometric method of detection with a detection limit of 2.5 × 10−8 M and a good confidence coefficient: 99.05%. The potential interfering ions, such as Cl, I, NO2, NO3, SCN, SO32−, SO42− and PO43− of 100-fold higher and Cl and R-S of 1000-fold higher concentrations in the mixture as compared to the determined concentration of bromide ions (c = 10−5 M), were tested and did not influence the results. The behavior of the sensitive porphyrin in various pH media was investigated in order to determine their influence upon the bromide detection capacity. View Full-Text
Keywords: Pt(II)-metalloporphyrin; UV-vis spectroscopy; AFM; bromide detection; potentiometric titration; real samples validation Pt(II)-metalloporphyrin; UV-vis spectroscopy; AFM; bromide detection; potentiometric titration; real samples validation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lascu, A.; Plesu, N.; Anghel, D.; Birdeanu, M.; Vlascici, D.; Fagadar-Cosma, E. Optical Detection of Bromide Ions Using Pt(II)-5,10,15,20-Tetra-(4-methoxy-phenyl)-porphyrin. Chemosensors 2019, 7, 21.

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