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A rapidly-reversible absorptive and emissive vapochromic Pt(II) pincer-based chemical sensor

Bryant, M. J., Skelton, J. M., Hatcher, L. E., Stubbs, C., Madrid, E., Pallipurath, A. R., Thomas, L. H., Woodall, C. H., Christensen, J., Fuertes, S., Robinson, T. P., Beavers, C. M., Teat, S. J., Warren, M. R., Pradaux-Caggiano, F., Walsh, A., Marken, F., Carbery, D. R., Parker, S. C., McKeown, N. B., Malpass-Evans, R., Carta, M. and Raithby, P. R. 2017. A rapidly-reversible absorptive and emissive vapochromic Pt(II) pincer-based chemical sensor. Nature Communications 8 , 1800. 10.1038/s41467-017-01941-2

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Abstract

Selective, robust and cost-effective chemical sensors for detecting small volatile-organic compounds (VOCs) have widespread applications in industry, healthcare and environmental monitoring. Here we design a Pt(II) pincer-type material with selective absorptive and emissive responses to methanol and water. The yellow anhydrous form converts reversibly on a subsecond timescale to a red hydrate in the presence of parts-per-thousand levels of atmospheric water vapour. Exposure to methanol induces a similarly-rapid and reversible colour change to a blue methanol solvate. Stable smart coatings on glass demonstrate robust switching over 104 cycles, and flexible microporous polymer membranes incorporating microcrystals of the complex show identical vapochromic behaviour. The rapid vapochromic response can be rationalised from the crystal structure, and in combination with quantum-chemical modelling, we provide a complete microscopic picture of the switching mechanism. We discuss how this multiscale design approach can be used to obtain new compounds with tailored VOC selectivity and spectral responses.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Additional Information: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License
Publisher: Nature Research
ISSN: 2041-1723
Date of First Compliant Deposit: 19 March 2020
Date of Acceptance: 26 October 2017
Last Modified: 28 Sep 2020 10:21
URI: https://orca.cardiff.ac.uk/id/eprint/130504

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