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V‑Shape Molecular Self-Adaption Triggered 2D Self-Assembled Polymorphism by Coadsorption of n-Tetradecane Solvent
journal contribution
posted on 2019-11-03, 13:13 authored by Yujia Wang, Jinxing Li, Tianze Hu, Meiqiu Dong, Juntian Wu, Xinrui Miao, Wenli DengThe self-assembly
of thienophenanthrene derivative with V-shape
conjugated core and four tetradecanoxyl chains (TPTD-Nap) at different
solution concentrations has been investigated at the liquid–solid
interface by scanning tunneling microscopy. n-Tetradecane
was chosen as the solvent because its alkyl chain is commensurate
with the length of the molecular side chains. At saturated concentration,
TPTD-Nap forms a linear pattern with long-range disorder and short-range
order. As the concentration decreases, a highly ordered linear structure
is observed. At low concentrations, TPTD-Nap molecules self-assemble
into three types of nanostructures with reduced packing density because n-tetradecane molecules participate in the self-assembled
process by the coadsorption at different levels. The most remarkable
feature of the TPTD-Nap arrangements is the self-adaption of symmetric
V-shape cores as well as the alkyl chain-length of the molecule and
solvent. The former contributes to fabricate the backbone of the nanostructures,
and the latter determines the self-assembled polymorphism by the coadsorption.
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self-assembled polymorphismconcentration decreasestetradecane moleculesself-assembled processTetradecane SolventTPTD-Nap arrangementsalkyl chain-lengthalkyl chainTPTD-Nap molecules self-assembleside chainstetradecanoxyl chainscoadsorptionscanning tunneling microscopyV-shape coresTPTD-Nap formsnanostructuresolution concentrations
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