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- W2128336644 abstract "Abstract An appropriate understanding of the process of self‐assembly is of critical importance to tailor nanostructured order on 2D surfaces with functional molecules. Photochromic compounds are promising candidates for building blocks of advanced photoresponsive surfaces. To investigate the relationship between molecular structure and the mechanism of ordering formation, 2‐thienyl‐type diarylethenes with various lengths of alkyl side chains linked through an amide or ester group were synthesized. Their self‐assemblies at a liquid/solid interface were investigated by scanning tunneling microscopy (STM). The concentration dependence of the surface coverage was analyzed by using a cooperative model for a 2D surface based on two characteristic parameters: the nucleation equilibrium constant ( K n ) and the elongation equilibrium constant ( K e ). The following conclusions can be drawn. 1) The concentration at which a stable 2D molecular ordering is observed by STM exponentially decreases with increasing length of the alkyl chain. 2) Compounds bearing amide groups have higher degrees of cooperativity in self‐assembly on 2D surfaces (i.e., σ , which is defined as K n / K e ) than compounds with ester groups. 3) The self‐assembly process of the open‐ring isomer of an ester derivative is close to isodesmic, whereas that of the closed‐ring isomer is cooperative because of the difference in equilibrium constants for the nucleation step (i.e., K n ) between the two isomers." @default.
- W2128336644 created "2016-06-24" @default.
- W2128336644 creator A5046264840 @default.
- W2128336644 creator A5065911136 @default.
- W2128336644 creator A5076164664 @default.
- W2128336644 date "2015-07-28" @default.
- W2128336644 modified "2023-10-18" @default.
- W2128336644 title "Effects of Alkyl Chain Length and Hydrogen Bonds on the Cooperative Self-Assembly of 2-Thienyl-Type Diarylethenes at a Liquid/Highly Oriented Pyrolytic Graphite (HOPG) Interface" @default.
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- W2128336644 doi "https://doi.org/10.1002/chem.201500707" @default.
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