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Commenting on the photoreactions of anthracene derivatives in the solid state

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Abstract

We review a series of photochemical reactions related to the renowned family of anthracene derivatives. We first classify the photodimerizations of 9-methyl-anthracene, 9-cyano-anthracene and 9-anthracene-carboxylic acid as topochemical, non-topochemical and reversible, respectively. We then introduce a chemical reaction where the lattice change involves two different molecular species. In the latter case, the compatibility of the reactive species occurs at the level of symmetry matching of the unit cells rather than via a correct registry of molecular orientations. We then describe the relationship between incoming photons and mechanical motion, a common occurrence in crystal-to-crystal photoreactions, which shows stunning effects when 9,10-dinitro-anthracene is transformed to anthraquinone. Finally, the kinetics of these systems is shortly discussed. By means of a micro-Raman technique, we are capable of monitoring, at the same time and on the very same spot, the molecular (intramolecular vibrations or internal motions) and the lattice (intermolecular vibrations or lattice phonons) transformations. It turns out that molecular changes start first, producing, in a following time, the symmetry modifications of the crystal lattice. The extent of the delay of the structural change may considerably vary depending upon the system studied.

Graphical abstract: Commenting on the photoreactions of anthracene derivatives in the solid state

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Publication details

The article was received on 05 Feb 2019, accepted on 29 Mar 2019 and first published on 29 Mar 2019


Article type: Highlight
DOI: 10.1039/C9CE00176J
CrystEngComm, 2019, Advance Article

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    Commenting on the photoreactions of anthracene derivatives in the solid state

    T. Salzillo and A. Brillante, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE00176J

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