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

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Author list: Einax M, Richter T, Nimmrich M, Rahe P, Stara IG, Stary I, Kuhnle A, Maass P

Publisher: American Institute of Physics

Place: MELVILLE

Publication year: 2016

Journal: The Journal of Chemical Physics (0021-9606)

Journal acronym: J CHEM PHYS

Volume number: 145

Issue number: 13

Number of pages: 7

ISSN: 0021-9606

eISSN: 1089-7690

Languages: English-Great Britain (EN-GB)

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Abstract

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. Published by AIP Publishing.

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