TY - JOUR
T1 - High charge-carrier mobility in π-deficient discotic mesogens
T2 - design and structure-property relationship
AU - Lehmann, Matthias
AU - Kestemont, Gaël
AU - Aspe, Rafael Gómez
AU - Buess-Herman, Claudine
AU - Koch, Michel H.J.
AU - Debije, Michael G.
AU - Piris, Jorge
AU - De Haas, Matthijs P.
AU - Warman, John M.
AU - Watson, Mark D.
AU - Lemaur, Vincent
AU - Cornil, Jérôme
AU - Geerts, Yves Henri
AU - Gearba, Raluca
AU - Ivanov, Dimitri A.
PY - 2005/5/20
Y1 - 2005/5/20
N2 - 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 cm2V -1s-1, respectively, for the decylsulfanyl derivative. Mobilities strongly depend on the nature of the side chains.
AB - 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 cm2V -1s-1, respectively, for the decylsulfanyl derivative. Mobilities strongly depend on the nature of the side chains.
KW - Charge-carrier mobility
KW - Columnar mesophases
KW - Electron-deficient mesogens
KW - Liquid crystals
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=19944408650&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=19944408650&partnerID=8YFLogxK
U2 - 10.1002/chem.200400586
DO - 10.1002/chem.200400586
M3 - Article
C2 - 15798976
AN - SCOPUS:19944408650
SN - 0947-6539
VL - 11
SP - 3349
EP - 3362
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 11
ER -