Stacking of oligo and polythiophenes cations in solution: surface tension and dielectric saturation

Details Stacking of oligo and polythiophenes cations in solution: surface tension and dielectric saturation Stacking of oligo and polythiophenes cations in solution: surface tension and dielectric saturation

2005-12-09

arxiv.org/abs/cond-mat/0512203v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.2198811

The stacking of positively charged (or doped) terthiophene oligomers and quaterthiophene polymers in solution is investigated applying a recently developed unified electrostatic and cavitation model for first-principles calculations in a continuum solvent. The thermodynamic and structural patterns of the dimerization are explored in different solvents, and the distinctive roles of polarity and surface tension are characterized and analyzed. Interestingly, we discover a saturation in the stabilization effect of the dielectric screening that takes place at rather small values of $\epsilon_0$. Moreover, we address the interactions in trimers of terthiophene cations, with the aim of generalizing the results obtained for the dimers to the case of higher-order stacks and nanoaggregates.

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