Tailoring Discotic Mesophases: Columnar Order Enforced with Hydrogen Bonds

Authors


  • This work was financially supported by the Communauté Française de Belgique (ARC No. 00/05-257), Fonds Emile Defay and through the DISCEL project (G5RD-CT-2000-00321). The synchrotron radiation work was supported by the European Union through the HCMP Access to Large Installation Project, Contract HPRI-CT-1999-00017 to the EMBL-Hamburg. We are grateful to H. Meier and A. Oehlhof for carrying out the MALDI-TOF measurements and the elemental analysis at the University of Mainz and to J. M. Warman, M. P. de Haas, D. Caprion, J. Cornil, M. Baus, and J.-P. Ryckaert for fruitful discussions.

Abstract

Hydrogen bonding can be used to significantly enforce the intra-columnar stacking order in discotic mesogens. The ordered hexagonal columnar mesophase of a HAT-CONHR derivative is characterized by the smallest inter-disk distance ever found in columnar liquid crystals (3.18–3.20 Å). This additional attractive interaction between the disks in the column results in a regular disc stacking and thus in a high charge-carrier mobility over the whole investigated temperature range (from room temperature up to 200 °C).

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