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Structural modifications to platinum(ii) pincer complexes resulting in changes in their vapochromic and solvatochromic properties

Bryant, Mathew J., Fuertes, Sara, Hatcher, Lauren E. ORCID: https://orcid.org/0000-0002-1549-9727, Thomas, Lynne H. and Raithby, Paul R. 2023. Structural modifications to platinum(ii) pincer complexes resulting in changes in their vapochromic and solvatochromic properties. Faraday Discussions 244 , pp. 411-433. 10.1039/d3fd00025g

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Abstract

There is a need to develop rapidly responsive chemical sensors for the detection of low concentrations of volatile organic solvents (VOCs). Platinum pincer complexes have shown promise as sensors because of their colours and vapochromic and solvatochromic properties, that may be related to the non-covalent interactions between the pincer complexes and the guest VOCs. Here we report an investigation into a series of Pt(ii) complexes based on the 1,3-di(pyridine)benzene tridentate (N⁁C⁁N) skeleton with the formula [Pt(N⁁C(R)⁁N)(CN)] (R = C(O)Me 2, C(O)OEt 3, C(O)OPh 4) with the fourth coordination site occupied by a cyanide ligand. Solid-state samples of the complexes have been tested with a range of volatiles including methanol, ethanol, acetone, dichloromethane and water, and while 2 displays thermochromism, 3 and 4 display rapidly reversible vapochromism and solvatochromism. These results are correlated with X-ray powder and single crystal X-ray structural data including an assessment of the crystal packing and the void space in the crystalline space. The cyanide ligand and the R substituents are involved in hydrogen bonding that creates the voids within the structures and interact with the solvent molecules that influence the Pt⋯Pt separation in the crystalline state.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Additional Information: License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/3.0/, Start Date: 2023-02-09
Publisher: Royal Society of Chemistry
ISSN: 1359-6640
Date of First Compliant Deposit: 27 April 2023
Date of Acceptance: 8 February 2023
Last Modified: 04 Oct 2023 16:52
URI: https://orca.cardiff.ac.uk/id/eprint/159072

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