Temperature-mediated polymorphism: impact on packing motifs and charge transport

Abstract
We report a novel synthesis to ultra high purity 7,14-bis((trimethylsilyl)ethynyl)dibenzo[b,def]-chrysene (TMS-DBC). Single crystals of this material were grown by solution and vapor deposition techniques and structural determination by single crystal X-ray crystallography was then carried out at the Microfocus Crystallography beamline at the Australian Synchrotron. Two polymorphs of TMS-DBC were observed; low temperature (LT) fine red needles and high temperature (HT) large yellow platelets. These polymorphs represent a rare example where both are extremely stable and do not interconvert to the other crystal structure upon solvent or thermal annealing. Single crystal X-ray crystallographic studies identified two distinct packing structures where the LT crystals form a 1D slipped-stack structure, while the HT crystals adopt a 2D brickwork motif. Single crystal organic field-effect transistors of the LT and HT crystals showed the impact of packing motif on charge transport.

Citation
Williamson, R. M., Collis, G., Jurchescu, O., Coropceanu, V., Bredas, J.-L., Fonari, A., … Stevens, L. (2017). Temperature-mediated polymorphism: impact on packing motifs and charge transport. Acta Crystallographica Section A Foundations and Advances, 73(a2), C770–C770. doi:10.1107/s2053273317088040

Publisher
INT UNION CRYSTALLOGRAPHY

Journal
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES

DOI
10.1107/S2053273317088040

Additional Links
http://scripts.iucr.org/cgi-bin/paper?S2053273317088040

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