Lanthanoid coordination with a tetrazole-substituted calixdiquinone and calixdihydroquinone
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This is an Accepted Manuscript of an article published by Taylor & Francis in Supramolecular Chemistry on 09/06/2019 available online at http://www.tandfonline.com/10.1080/10610278.2019.1625357
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group. The tetrazole-functionalised calixdiquinone 5,17-di-tert-butyl-26,28-bis-(1H-tetrazole-5-ylmethoxy)-calix-25,27-diquinone Q was synthesised by chemical oxidation of the bis-tetrazole calixarene precursor using PbO2/HClO4. The single crystal X-ray structure determination of Q confirmed the structure and showed binding of a water molecule in the solid state. Chemical reduction of Q to the dihydroquinone QR was achieved using N,N-diethylhydroxylamine. Comparison of the solution phase photophysical properties of Q or QR in the presence of terbium ions showed significant excitation only with QR, suggesting redox switching of the photophysical response may be possible with this or similar receptor.
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