New Tritopic Terpyridine‐based Fluorescent Probe for the Efficient Determination of Th4+, Zn2+ and F Ions

Author:

Pavankumar B. B.1,Ranjan Prabodh2,Panicker Rakesh R.1,Jha Prakash C.3,Brahmananda Rao C. V. S.4,Desikan Rajagopal1,Sivaramakrishna Akella1ORCID

Affiliation:

1. Department of Chemistry School of Advanced Sciences Vellore Institute of Technology (VIT) Vellore 632014 Tamil Nadu India

2. Department of Chemical Engineering Indian Institute of Technology Madras Tamil Nadu 600036 India

3. Center of Applied Chemistry Central University of Gujarat Gandhinagar 382030 Gujarat India

4. Fuel Chemistry Division Materials Chemistry and Metal Fuel Cycle Group Indira Gandhi Centre for Atomic Research Kalpakkam 603102 Tamil Nadu India

Abstract

AbstractThe present work demonstrates the determination of thorium (Th4+), zinc (Zn2+) and fluoride (F) ions by employing a substituted tripodal terpyridine (TP) as a fluorescence sensor. The distinct fluorescence intensities of the free TP and TP‐M complexes (M=Zn2+or Th4+) with the same emission wavelength at 468 nm were observed in steady‐state photoluminescence (PL) spectra at pH 7.0 with a 1 : 3 ratio of metal to the ligand. A ratiometric dual fluorescence signals for Zn2+ and Th4+ were displayed by the probe TP at varied concentrations. Furthermore, the quantitative determination of F ions was achieved through the addition of F to the tripod‐terpyridine‐zinc complex (TP‐Zn2+) where the fluorescence intensity decreases gradually. Notably, the present work facilitates the LOD (limit of detection) as 1.1×10−10 M, 1.01×10−8 M and 3.18×10−10 M and further LOQ (limit of quantification) as 0.37×10−9 M, 0.33×10−7 M and 5.26×10−9 M for Zn2+, Th4+ and F ions, respectively. The predicted absorption spectra of TP show HOMO to LUMO+2 electronic excitation at 358 nm whereas the complex TP‐Th4+ exhibits HOMO to LUMO+1 electronic excitation at 568 nm.

Publisher

Wiley

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