Cyclic siloxanes conjugated with fluorescent aromatic compounds as fluoride sensors

Nicha Prigyai,Vuthichai Ervithayasuporn,Mongkol Sukwattanasinitt,Sutthiroj Thanyalax,Supphachok Chanmungkalakul

doi:10.1039/d0ma00476f

Nicha Prigyai, Vuthichai Ervithayasuporn + Show 3 more

Open Access

https://doi.org/10.1039/d0ma00476f

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Journal: Materials advances	Publication Date: Jan 1, 2020
Citations: 8	License type: CC BY 3.0

Affiliation: Mahidol University, Chulalongkorn University

Abstract

When cyclic siloxanes were exposed to fluoride ions, a blue-shift and enhanced fluorescence emissions appeared in most organic solvents.

Highlights

In the last two decades, the usage of organosilica-based cage materials has expanded to cover many fields of applications such as catalytic supports, polymers, biocompatible materials and sensors.[29]
The interactions between cyclic siloxanes and fluoride ions were studied via FTIR, Electronic supplementary information (ESI)-MS and NMR experiments
Two cyclic siloxanes conjugated with anthracene (D4An) and pyrene (D4Py) were successfully synthesized with high fluorescence emission

Summary

Introduction

In the last two decades, the usage of organosilica-based cage materials has expanded to cover many fields of applications such as catalytic supports, polymers, biocompatible materials and sensors.[29] Previously, we have reported fluorescent organosilica-based cage materials for both efficient fluoride detection and adsorption.[30,31,32] The principle of electrostatic interaction between fluoride ions and the potential surface of 3358 | Mater. Paper organosilica cages, which plays a role in the attraction of positive and negative parts to each other, in those materials has been proposed.[33] Those responsive changes in fluorescence emission involve the conversion of an exciplex signal to a monomer signal due to FÀ induced conformational changes of the cage.[34] Intriguingly, the less rigid cyclic siloxanes, in comparison with the cage siloxanes, are worth exploring as they are more common starting materials for silicone and gel materials. The interactions of fluoride and cyclic siloxanes were supported by computations as well as FTIR and 19F NMR spectroscopy. This work aims to demonstrate the application of cyclic siloxanes as an anchoring platform for anion sensors

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