High charge-carrier mobility in pi-deficient discotic mesogens: design and structure-property relationship

M. Lehmann, G. Kestemont, R.G. Aspe, C. Buess-Herman, M.H.J. Koch, M.G. Debije, J. Piris, M.P. Haas, de, J.M. Warman, M.D. Watson, V. Lemaur, J. Cornil, Y.H. Geerts, R. Gearba, D. A. Ivanov

Research output: Contribution to journalArticleAcademicpeer-review

166 Citations (Scopus)
3 Downloads (Pure)


Hexaazatrinaphthylene (HATNA) derivatives with six alkylsulfanyl chains of different length (hexyl, octyl, decyl and dodecyl) have been designed to obtain new potential electron-carrier materials. The electron-deficient nature of these compounds has been demonstrated by cyclic voltammetry. Their thermotropic behaviour has been studied by means of differential scanning calorimetry and polarised optical microscopy. The supramolecular organisation of these discotic molecules has been explored by temperature-dependent X-ray diffraction on powders and oriented samples. In addition to various liquid crystalline columnar phases (Colhd, Colrd), an anisotropic plastic crystal phase is demonstrated to exist. The charge-carrier mobilities have been measured with the pulse-radiolysis time-resolved microwave-conductivity technique. They are found to be higher in the crystalline than in the liquid crystalline phases, with maximum values of approximately 0.9 and 0.3 cm2¿V-1¿s-1, respectively, for the decylsulfanyl derivative. Mobilities strongly depend on the nature of the side chains.
Original languageEnglish
Pages (from-to)3349-3362
JournalChemistry : A European Journal
Issue number11
Publication statusPublished - 2005


Dive into the research topics of 'High charge-carrier mobility in pi-deficient discotic mesogens: design and structure-property relationship'. Together they form a unique fingerprint.

Cite this