Stable radicals act as effective organic semiconductors with a narrow electrochemical window that facilitates charge pair photogeneration. In this context, we reported 6-oxoverdazyl derivatives, that exhibit discotic behavior and photovoltaic properties.[1,2] In continuation of our search for new types of supramolecular arrangements and enhanced charge transport, we focused on the bent-core molecular architecture. We now present the synthesis and structure-property relationships of bent-core mesogens with the verdazyl as the angular central unit.[3] In particularly, we report the influence of the head substituent X and the structure of “arms” R on liquid crystalline properties, which include nematic, a novel 3D tetragonal (Tet), and re-entrant isotropic (Ire) phases. Results of optical, thermal, spectroscopic, powder XRD, and photoconductivity analyses will be presented. References: 1. A. Jankowiak, D. Pociecha, J. Szczytko, H. Monobe, P. Kaszyński, J. Am. Chem Soc. 2012, 134, 2465-2468. 2. A. Jankowiak, D. Pociecha, H. Monobe, J. Szczytko, P. Kaszyński, Chem. Commun. 2012, 7064-7066. 3. M. Jasiński, D. Pociecha, H. Monobe, J. Szczytko, P. Kaszyński, J. Am. Chem. Soc., dx.doi.org/10.1021/ja507594

Bent-core 6-oxoverdazyls - a new class of mesogens

249th National Meeting (2015)

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