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α-Oligofurans: A Computational Study
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DOI：10.1002/chem.201300257.png)
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Recently, -oligofurans have emerged as interesting and promising organic electronic materials that have certain advantages over -oligothiophenes. In this work, -oligofurans were studied computationally, and their properties were compared systematically with those of the corresponding oligothiophenes. Although the two materials share similar electronic structures, overall, this study revealed important differences between -oligofurans and -oligothiophenes. Twisting studies on oligofurans revealed them to be significantly more rigid than oligothiophenes in the ground state and first excited state. Neutral -oligofurans have more quinoid character, higher frontier orbital energies, and higher HOMO-LUMO gaps than their -oligothiophene counterparts. The theoretical results suggest that oligofurans (and subsequently polyfuran) have lower ionization potentials than the corresponding oligothiophenes (and polythiophene), which in turn predicts that oligofurans can be lightly doped more easily than oligothiophenes. Oligofuran dications (8F(2+)-14F(2+)) of medium-sized and longer chain lengths show a polaron-pair character, and the polycations of -oligofurans cannot accommodate high positive charges as easily as their thiophene analogues.
Keyword:
density functional calculations
doping
oligofurans
oligothiophenes
pi-conjugated materials
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