Using 5,10,15,20-tetra(4-nitrophenyl)porphyrin as a fluorescent chemosensor to determine Ru³⁺

Tienkul Kangwanwong^a, Wanchai Pluempanupat^a, Waraporn Parasuk^a, Helen E. Keenan^b, Apisit Songsasen^a,*

ABSTRACT: The 5,10,15,20-tetra(4-nitrophenyl)porphyrin (TNPP) has been synthesized using the reaction of pyrrole and 4-nitrobenzaldehyde in the presence of propionic acid. The TNPP was used as a new fluorescent chemosensor to determine Ru³⁺ with higher selectivity than other ions such as Hg²⁺, CH₃Hg⁺, Ag⁺, Co²⁺, Cd²⁺, Ni²⁺, Cr³⁺, Fe³⁺, Cu²⁺, or Zn²⁺. The response of the new chemosensor is reported in the form of fluorescence quenching, which is attributed to the metalloporphyrin formation of Ru-TNPP complex with 1:1 stoichiometric ratio (K_stab=2.04 × 10⁸). The synthesized fluorescence chemosensor can be used to determine Ru³⁺ with a detection limit of 0.89 µM (90 ppb) and a linear quantification range between 3 and 25 µM. Therefore, the synthesized chemosensor could be used as a new fluorescence chemosensor for the quantitative analysis of Ru³⁺ with satisfactory results.

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^a	Department of Chemistry and Centre for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900 Thailand
^b	David Livingstone Centre for Sustainability, Department of Civil Engineering, University of Strathclyde, Glasgow, Scotland G1 1XN, United Kingdom

* Corresponding author, E-mail: fsciass@ku.ac.th

Received 11 Jan 2012, Accepted 12 Jun 2012

Using 5,10,15,20-tetra(4-nitrophenyl)porphyrin as a fluorescent chemosensor to determine Ru3+

Tienkul Kangwanwonga, Wanchai Pluempanupata, Waraporn Parasuka, Helen E. Keenanb, Apisit Songsasena,*

Using 5,10,15,20-tetra(4-nitrophenyl)porphyrin as a fluorescent chemosensor to determine Ru³⁺

Tienkul Kangwanwong^a, Wanchai Pluempanupat^a, Waraporn Parasuk^a, Helen E. Keenan^b, Apisit Songsasen^a,*