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Photoreversible ion-binding using spiropyran modified silica microbeads

journal contribution
posted on 2023-05-17, 06:57 authored by Scarmagnani, S, Slater, S, Benito-Lopez, F, Diamond, D, Walsh, Z, Brett PaullBrett Paull, Miroslav MackaMiroslav Macka
In this paper, we report the covalent immobilisation of spiropyran on silica microbeads of 5 �m diameter and subsequent evaluation of the photoswitchable behaviour and light-modulated ion-binding properties of the spiropyran modified silica microbeads towards a range of different metal ions. The beads can be effectively switched using light emitting diodes between a white spiropyran form (by irradiation with a white 430-760 nm light emitting diode) and a pink merocyanine form (upon irradiation with a UV light 375 nm emitting diodes) that undergoes, under exposure to certain metal ions (such as Cu2+ and Zn2+, final concentration of 7.7 times 10-4 M in ethanol solution), a further reversible spectral and colour change due to the formation of merocyanine-metal ion complexes. Furthermore, the accumulated ions can subsequently released from the beads on demand using light emitting diodes to reform the inactive spiro form.

History

Publication title

International Journal of Nanomanufacturing

Volume

5

Issue

1-2

Pagination

38-52

ISSN

1746-9392

Department/School

School of Natural Sciences

Publisher

Inderscience Publishers

Place of publication

United Kingdom

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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