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Liquid‐Crystalline Rigid‐Core Semiconductor Oligothiophenes: Influence of Molecular Structure on Phase Behaviour and Thin‐Film Properties
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 - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701368
Subject(s) - differential scanning calorimetry , materials science , optical microscope , phase (matter) , phase transition , diffraction , crystallography , liquid crystal , glass transition , semiconductor , thin film , liquid crystalline , chemical engineering , polymer , scanning electron microscope , optics , organic chemistry , nanotechnology , chemistry , composite material , optoelectronics , condensed matter physics , thermodynamics , physics , engineering
The design, synthesis and properties of liquid‐crystalline semiconducting oligothiophenes containing dithienothiophene (DTT), benzothiadiazole (BTZ) and carbazole (CBZ) rigid cores are described. The effect of molecular structure (shape, size and substitution) on their thermal behaviour and electrical properties has been investigated. Polarised optical microscopy (POM) and differential scanning calorimetry (DSC) analyses have revealed highly ordered smectic mesophases for most of the newly synthesised compounds. X‐ray diffraction (XRD) studies performed at various temperatures have shown that the smectic order is retained in the crystalline state upon cooling across the transition temperature, affording cast films with a more favourable morphology for FET applications.