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Efficient synthesis of pyrene-1-carbothioamides and carboxamides. Tunable solid-state fluorescence of pyrene-1-carboxamides

Wrona-Piotrowicz, A; Zakrzewski, J; Metivier, R; Brosseau, A; Makal, A; Wozniak, K RSC ADVANCES, 2014, 4, 56003-56012.

Pyrene reacts with potassium thiocyanate and organic isothiocyanates in the presence of trifluoromethanesulfonic acid to afford primary and secondary pyrene-1-carbothioamides in high yields. These compounds were efficiently oxidatively desulfurized with Oxone (R) to the corresponding carboxamides. The amides display solid-state fluorescence with quantum efficiencies up to 62%, originating from monomers, aggregates (such as preformed dimers), and/or excimers, depending on the substituent at the nitrogen atom. Single crystal X-ray diffraction characterization of one highly emissive compound supports this assumption.

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Publication

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Paru le 23 octobre 2014

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DOI: 10.1039/c4ra07045c