An unforeseen polymorph of coronene by the application of magnetic fields during crystal growth

Jason Potticary, Lui R. Terry, Christopher Bell, Alexandros N. Papanikolopoulos, Peter C. M. Christianen, Hans Engelkamp, Andrew M. Collins, Claudio Fontanesi, Gabriele Kociok-Köhn, Simon Crampin, Enrico Da Como and Simon R. Hall ()
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Jason Potticary: Complex Functional Materials Group, School of Chemistry, University of Bristol
Lui R. Terry: Complex Functional Materials Group, School of Chemistry, University of Bristol
Christopher Bell: School of Physics, HH Wills Physics Laboratory, Tyndall Avenue
Alexandros N. Papanikolopoulos: High Field Magnet Laboratory (HFML-EMFL), Radboud University
Peter C. M. Christianen: High Field Magnet Laboratory (HFML-EMFL), Radboud University
Hans Engelkamp: High Field Magnet Laboratory (HFML-EMFL), Radboud University
Andrew M. Collins: Bristol Centre for Functional Nanomaterials, HH Wills Physics Laboratory
Claudio Fontanesi: University of Bath, Claverton Down
Gabriele Kociok-Köhn: University of Bath, Claverton Down
Simon Crampin: University of Bath, Claverton Down
Enrico Da Como: University of Bath, Claverton Down
Simon R. Hall: Complex Functional Materials Group, School of Chemistry, University of Bristol

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract The continued development of novel drugs, proteins, and advanced materials strongly rely on our ability to self-assemble molecules in solids with the most suitable structure (polymorph) in order to exhibit desired functionalities. The search for new polymorphs remains a scientific challenge, that is at the core of crystal engineering and there has been a lack of effective solutions to this problem. Here we show that by crystallizing the polyaromatic hydrocarbon coronene in the presence of a magnetic field, a polymorph is formed in a β-herringbone structure instead of the ubiquitous γ-herringbone structure, with a decrease of 35° in the herringbone nearest neighbour angle. The β-herringbone polymorph is stable, preserves its structure under ambient conditions and as a result of the altered molecular packing of the crystals, exhibits significant changes to the optical and mechanical properties of the crystal.

Date: 2016
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DOI: 10.1038/ncomms11555

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