Spontaneous chirality in an octupolar discotic crystal

Stijn J. Van Cleuvenbergen; Monique A. Van der Veen; Inge Asselberghs; Gunther Hennrich; Thierry Verbiest; Koen Clays

doi:10.1117/12.893488

19 September 2011 Spontaneous chirality in an octupolar discotic crystal

Stijn J. Van Cleuvenbergen, Monique A. Van der Veen, Inge Asselberghs, Gunther Hennrich, Thierry Verbiest, Koen Clays

Proceedings Volume 8113, Linear and Nonlinear Optics of Organic Materials XI; 81130F (2011) https://doi.org/10.1117/12.893488
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

In the quest for organic second-order nonlinear materials, self-assembled structures based on octupolar molecules have shown to be promising candidates. The presented work focuses on an octupolar substituted 1,3,5-trisalkynylbenzene that forms crystals that show significant second-harmonic generation (SHG). Continuous polarization SHG measurements were performed to elucidate the tensorial nature of this response. Unfortunately the model at hand was unable to fit the polarization patterns due to depolarization of the second harmonic beam caused by multiple scattering in the sample. Although the chromophore is clearly achiral, these patterns revealed a different response for left and right circularly polarized light, also known as SHG circular difference. This implies that these molecules spontaneously assemble in chiral superstructures. These surprising results were confirmed by circular dichroism spectroscopy, revealing a monosignate CD band that must be attributed to a supramolecular chiral organization.

Citation Download Citation

Stijn J. Van Cleuvenbergen, Monique A. Van der Veen, Inge Asselberghs, Gunther Hennrich, Thierry Verbiest, and Koen Clays "Spontaneous chirality in an octupolar discotic crystal", Proc. SPIE 8113, Linear and Nonlinear Optics of Organic Materials XI, 81130F (19 September 2011); https://doi.org/10.1117/12.893488

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