High Charge Carrier Mobility in p-Deficient Discotic Mesogens: Design and Structure-Property Relationship

[en] 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.

Disciplines :

Chemistry
Physics

Author, co-author :

Lehmann, M.

Kestemont, G.

Gomez Aspe, R.

Buess-Herman, Claudine

Koch, M.J.H.

Debije, M.G.

Piris, J.

de Haas, M.P.

Warman, J.M.

Watson, M.D.

More authors (5 more)

Language :

English

Title :

High Charge Carrier Mobility in p-Deficient Discotic Mesogens: Design and Structure-Property Relationship

Publication date :

20 May 2005

Journal title :

Chemistry

ISSN :

0947-6539

eISSN :

1521-3765

Publisher :

John Wiley & Sons, United Kingdom

Volume :

Issue :

Pages :

3349-3362

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

S817 - Chimie des matériaux nouveaux

Research institute :

R400 - Institut de Recherche en Science et Ingénierie des Matériaux

Commentary :

Lecture en ligne: http://onlinelibrary.wiley.com/doi/10.1002/chem.200400586/pdf Publié en ligne le 30 mars 2005

Available on ORBi UMONS :

since 10 June 2010

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