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http://dx.doi.org/10.5012/bkcs.2003.24.11.1649

Towards Designing Environmentally Stable Conjugated Polymers with very Small Band-Gaps  

Hong, Sung Y. (Department of Chemistry, Institute of Natural Science, Kosin University)
Kim, Sung C. (Department of Chemistry, Institute of Natural Science, Kosin University)
Publication Information
Bulletin of the Korean Chemical Society / v.24, no.11, 2003 , pp. 1649-1654 More about this Journal
Abstract
We have investigated substituent effect on the stabilization energies, and nucleus-independent chemical shifts of pentafulvalenes and on the electronic structures of the corresponding polypentafulvalenes to design environmentally stable semiconductive or conductive polymers. Geometrical optimizations of the molecules were carried out at the density functional level of theory with B3LYP hybrid functional and 6-311+G(d) basis set. Stabilization energies were estimated using isodesmic and homodesmotic reactions. As a criterion of aromaticity nucleus-independent chemical shifts of the molecules were computed using GIAO approach. For the polymers the geometrical parameters were optimized through AM1 band calculations and the electronic structures were obtained through modified extended Huckel band calculations. It is found that strong electronwithdrawing substituents increase isodesmic and homodesmotic stabilization energies of pentafulvalene, though it does not increase the aromaticity. Nitro-substituted pentafulvalene is estimated to have stabilization energy as much as azulene. However, substitution either with electron-donating groups or with electronwithdrawing groups does not significantly affect the electronic structures of polypentafulvalene and poly (vinylenedioxypentafulvalene).
Keywords
Quantum-chemical investigation; Aromaticity; Stabilization energy; Nucleus-independent chemical shifts; Small band-gap polymers;
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