Model systems oligothiophenes

Still, unsubstituted a-nT is a model system used in recent literature. One disadvantage towards application of the unsubstituted oligothiophenes however is the poor solubility of the rigid rods [34]. 

J. Casado, M. C. Ruiz Delgado, Y. Shirota, V. Hernandez, J. T. Lopez Navarrete, Computation and spec-troelectrochemistry as complementary tools for the study of electrochemicaUy induced charged defects in 4-[bis(4-methylphenyl)amino]phenyl oligothiophenes as model systems for hole-transporting materials, J. Phys. Chem. B, 107, 2637-2644 (2003). 

More detailed information on the Al/thiophene system can be obtained from data on studies of the interaction between aluminum and an oligothiophene, a-sexi-thienylene (a-6T). The two main advantages in using a model system like a-6T are (I) the lack of aliphatic side chains that can obscure the C( l.s) signal from the carbon... 

It will be shown in this article that oligothiophenes are not only model substances for polythiophenes but often have superior properties. The results will show that a substantial knowledge could be collected over the last years but that there are also many unresolved problems to date. In particular, real applications are still rare and are limited to prototype studies. The major drawback is the poor long-term stability of the devices which is an inherent problem of nearly all organic-based systems. 

Oligothiophenes with well defined structures have recently received a great deal of attentions not only as a model eompoimds for conducting polymers, but also as anew class of functional r-electron systems [153], Since the initial discovery of organic compounds showing metallic conductivity, for which 2000 Nobel prize in chemistry was awarded [154-156], oligo- and polythiophenes have attracted much attention as advanced molecules with practical use in electronic devices [157-160] and their potential application in field-effect transistors [161], photovoltaic devices [162] and organic electroluminescent devices [163],... 

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