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Cover Picture: Liquid‐Crystalline Rigid‐Core Semiconductor Oligothiophenes: Influence of Molecular Structure on Phase Behaviour and Thin‐Film Properties (Chem. Eur. J. 36/2007)
Author(s) -
Melucci Manuela,
Favaretto Laura,
Bettini Christian,
Gazzano Massimo,
Camaioni Nadia,
Maccagnani Piera,
Ostoja Paolo,
Monari Magda,
Barbarella Giovanna
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200790138
Subject(s) - materials science , core (optical fiber) , semiconductor , phase (matter) , organic semiconductor , chemical engineering , optoelectronics , crystallography , composite material , organic chemistry , chemistry , engineering
Promotion of liquid‐crystalline behavior in oligothiophenes was achieved by M. Melucci and co‐workers (see p. 10046 ff.) by applying a new design‐strategy based on the insertion of a rigid inner core, such as dithienothiophene, benzothiadiazole, or carbazole, and hexyl chains as ends. Oligomers of different size and shape were synthesized by a highly efficient microwave‐assisted protocol. Most of the newly synthesized materials showed ordered smectic mesophases and maintained the smectic order by slow cooling to room temperature. Semiconducting behavior in field‐effect transistors from cast and vacuum‐evaporated films was demonstrated.