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Growth kinetics of racemic heptahelicene-2-carboxylic acid nanowires on calcite (104)

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    0466977 - ÚOCHB 2017 RIV US eng J - Journal Article
    Einax, M. - Richter, T. - Nimmrich, M. - Rahe, P. - Stará, Irena G. - Starý, Ivo - Kühnle, A. - Maass, P.
    Growth kinetics of racemic heptahelicene-2-carboxylic acid nanowires on calcite (104).
    Journal of Chemical Physics. Roč. 145, č. 13 (2016), č. článku 134702. ISSN 0021-9606. E-ISSN 1089-7690
    Institutional support: RVO:61388963
    Keywords : heptahelicene-2-carboxylic acid nanowires * nc-AFM * calcite * growth kinetics
    Subject RIV: CC - Organic Chemistry
    Impact factor: 2.965, year: 2016

    Molecular self-assembly of racemic heptahelicene-2-carboxylic acid on a dielectric substrate at room temperature can be used to generate wire-like organic nanostructures consisting of single and double molecular rows. By means of non-contact atomic force microscopy, we investigate the growth of the wire-like pattern after deposition by experimental and theoretical means. From analyzing the time dependence of the mean row length, two distinct regimes were found. At the early post-deposition stage, the mean length grows in time. Subsequently, a crossover to a second regime is observed, where the mean row length remains nearly constant. We explain these findings by a mean-field rate equation approach providing a comprehensive picture of the growth kinetics. As a result, we demonstrate that the crossover between the two distinct regimes is accomplished by vanishing of the homochiral single rows. At later stages only heterochiral double row structures remain.
    Permanent Link: http://hdl.handle.net/11104/0265145

     
     
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