High charge-carrier mobility in π-deficient discotic mesogens:: Design and structure-property relationship

被引:165
作者
Lehmann, M
Kestemont, G
Aspe, RG
Buess-Herman, C
Koch, MHJ
Debije, MG
Piris, J
de Haas, MP
Warman, JM
Watson, MD
Lemaur, V
Cornil, J
Geerts, YH
Gearba, R
Ivanov, DA
机构
[1] Free Univ Brussels, Lab Phys Polymers, B-1050 Brussels, Belgium
[2] Free Univ Brussels, Lab Chim Analyt & Chim Interfaces, B-1050 Brussels, Belgium
[3] Free Univ Brussels, Lab Chim Polymers, B-1050 Brussels, Belgium
[4] EMBL, DESY, D-22603 Hamburg, Germany
[5] Delft Univ Technol, IRI, NL-2629 JB Delft, Netherlands
[6] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[7] Univ Hohenheim, Lab Chem Novel Mat, Ctr Res Mol Elect & Photon, D-7000 Stuttgart, Germany
关键词
charge-carrier mobility; columnar mesophases; electron-deficient mesogens; liquid crystals; X-ray diffraction;
D O I
10.1002/chem.200400586
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hexaazatrinaphthylene (HATNA) derivatives with six alkylsulfanyl chains of different length (hexyl, octvl, 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 (Col(hd), Col(rd)), 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 cm(2) V-1 s(-1), respectively, for the decylsulfanyl derivative. Mobilities strongly depend on the nature of the side chains.
引用
收藏
页码:3349 / 3362
页数:14
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