Abstract
5,10,15,20-tetramethoxyphenylporphyrinatotin (IV) (SnTMPP) was synthesised. SnTMPP exhibited Soret band at 432 nm and emission peaks at 629 and 682 nm. The fluorescence intensity of SnTMPP was quenched in the presence of guanine linearly in the range 4 × 10–9 M to 7.2 × 10–8 M and the quenching response was found to be stable even in the presence of other nucleosides such as adenine, cytosine, uracil, thymine, alanine, aspartic acid and ascorbic acid. The detection limit was found to be 0.17 nM and the mechanism behind the decrease in the fluorescence intensity of SnTMPP in the presence of guanine is due to dynamic quenching, which was confirmed by cyclic voltammetric studies and life time studies. The CV studies illustrates the possibilty for an electron transfer between the guanine and the electron deficient metal core of SnTMPP.
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Acknowledgements
The authors are grateful to University Grants Commission-Basic Science Research, India, Department of Science and Technology, India, Peformance Linked Encouragement for Academic Studies and Endeavour,Government of Kerala, India, Department of Science and Technology—Fund for Improvement of S&T Infrastructure, India, University Grants Commission-Special Assistance Programme, India and Cochin University of Science and Technology, India for funding. The authors also express their gratitude to Sophisticated Tests and Instrumentation Centre of Cochin University of Science and Technology for analysis.
Funding
The authors are grateful to University Grants Commission-Basic Science Research, India, Department of Science and Technology, India, Peformance Linked Encouragement for Academic Studies and Endeavour,Government of Kerala, India, Department of Science and Technology—Fund for Improvement of S&T Infrastructure, India, University Grants Commission-Special Assistance Programme, India and Cochin University of Science and Technology, India for funding.
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Shijo Francis – Written the manuscript and experimental investigation. Leena Rajith – Planned and guided the entire work, helped in interpreting the results and writing the manuscript.
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Francis, S., Rajith, L. Nanomolar Fluorescent Detection of Guanine Using Tin Porphyrin. J Fluoresc 34, 1049–1056 (2024). https://doi.org/10.1007/s10895-023-03336-7
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DOI: https://doi.org/10.1007/s10895-023-03336-7