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Synthesis of Tetra(m-nitrophenyl)porphyrin as Sensing Material for Recognition of Lead(II) Ion

Rosliana Rusli1, Salasiah Endud1*, Hendrik O. Lintang2,3 and Zainab Ramli1
1Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia,
81310 UTM Johor Bahru, Johor, Malaysia
2Ma Chung Research Center for Photosynthetic Pigments, Universitas Ma Chung,
Villa Puncak Tidar N-01, Malang 65151, East Java, Indonesia
3Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia

*Corresponding author (e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)

  

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ABSTRACT

The monitoring of lead in the environment has gained importance because lead(II) ion is a toxic metal ion causing adverse environmental and health problems. In this paper, we reported the synthesis of 5,10,15,20-tetra(m-nitrophenyl)porphyrin as a sensing material aimed at the recognition of lead(II) ion. The synthesis and ion binding characteristics of the 5,10,15,20-tetra(m-nitrophenyl)porphyrin were investigated using FTIR, 1H NMR, and UV-Vis spectroscopy. The binding of lead(II) ion to the 5,10,15, 20-tetra(m-nitrophenyl)porphyrin was found to give a new peak in the absorption spectra at 473.35 nm along with two isosbestic points at 483 nm and 465 nm, suggesting porphyrin complex formation of 5,10,15, 20-tetra(m-nitrophenyl)porphyrin-lead(II). The calculated limit of detection for lead(II) ion using 5,10,15, 20-tetra(m-nitrophenyl)porphyrin is 3.67 X 10–4 M and the association constant, Kass is 1.56 ? 102 M–1. Herein, it was proposed that a new coordination compound was formed between lead(II) ion with 5,10,15, 20-tetra(m-nitrophenyl)porphyrin through nitro group chromophore.

Key words: Lead(II) ion; porphyrin; sensing; chromophore 
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