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Journal of Fluorescence

, Volume 28, Issue 5, pp 1105–1114 | Cite as

Bis-(2-Hydroxybenzylidene)-1H-Pyrazole 3,5-Dicarbohydrazide as a Novel Chemosensor for the Detection of Endogenous Zinc: A Fluorometric Study

  • Krishna Naik
  • Vidyanand Revankar
ORIGINAL ARTICLE
  • 89 Downloads

Abstract

The study reports synthesis and photophysical studies of a new zinc sensing pyrazole scaffold structurally characterized to be bis(2-hydroxybenzylidene)-1H-pyrazole-3,5-dicarbohydrazide (PHSA). Excitation of the probe at 330 nm results in an emission band at 417 nm which ratiometrically red shifts to 466 nm upon Zn2+ addition in an unprecedented way. The photo induced electron transfer (PET) coupled intramolecular charge transfer (ICT) working for a dual-channel fluorescence emission pathway is observed and studies were supported with density functional theory and NMR titration experiments. The probe exhibited dissociation constant of 1.2156 and detection limit as low as 992 nM. The cytotoxic effects of the probe on 60 tumour cell lines were tested. The intracellular zinc sensing with reversible binding potential is verified with fluorescence microscopy experiment.

Keywords

Zn2+ sensor ‘Turn on’ sensor PET/ICT Ratiometric Zn sensing Cell imaging 

Notes

Acknowledgements

The instrumental access provided by the USIC and Department of Chemistry, Karnatak University, Dharwad is gratefully acknowledged. The study is supported financial assistance from UGC in the form of Major Research Project [F.No. 37-246/2009(SR) dated 12.01.2010]. The author, KN thanks Mrs. Geeta Pawashe and Mr. Bheemanagouda Patil for useful input in the manuscript. The authors are indebted to National Cancer Institute (NCI) Bethesda, Maryland, USA, for the antitumor studies under the Developmental Therapeutic Program (DTP).

Supplementary material

10895_2018_2273_MOESM1_ESM.docx (36.1 mb)
ESM 1 (DOCX 36932 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ChemistryKarnatak UniversityDharwadIndia

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