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Aggregation Enhanced Excimer Emission Supported, Monomeric Fluorescence Quenching of Dendritic Hyperbranched Polyglycerol Coupled 1-Pyrene Butyric Acid Lumophore as a Sensing Probe for Fe2O3 Nanoparticles

  • Sherin Philip
  • Sunny KuriakoseEmail author
ORIGINAL ARTICLE

Abstract

Pyrene butyric acid (PBA) is a well studied lumophore for its exciting fluorescent properties. The current study focussed on a dendritic modification of PBA with hyperbranched polyglycerols (HPG) by Steglich esterification and further doping with iron oxide nanoparticles (IONP) of α-Fe2O3 phase. The covalent coupling between HPG and PBA was confirmed by FTIR and 1H-NMR spectra. The main objective of the study was to monitor the fluorescent properties of the modified and doped products. Steady state PL emission studies showed a considerable decrease in fluorescence intensity on HPG modification which almost completely disappeared on doping with IONP. This suggests that this fluorosensing property can be explored in identification and estimation of iron oxide nanoparticles which has a great significance in biomedical field both in diagnostics and therapeutics. Lifetime measurements with TCSPC suggested an aggregation enhanced quenching of HPG-PBA conjugates and mixed static and dynamic mechanisms in IONP doped HPG-PBA conjugates.

Graphical Abstract

Keywords

PBA HPG-PBA HPG-PBA-IONP Aggregation Excimer Quenching 

Notes

Acknowledgements

The authors acknowledge Prof. Holger Frey and his group, Johannes-Gutenberg University, Mainz, Germany. Also, the first author thanks University Grants Commission for Junior Research Fellowship (Sr.No-2061410045 Ref.No-22/06/2014 (i) EU-V).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistrySt. Thomas CollegePalaiIndia
  2. 2.Mahatma Gandhi UniversityKottayamIndia

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