A systematic study of thermochromic aromatic donor-acceptor materials.
A systematic study of thermochromic aromatic donor-acceptor materials.
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DOI:
10.1021/jo101498b
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发表时间:
2010-11-19
影响因子:
3.6
通讯作者:
Iverson, Brent L.
中科院分区:
文献类型:
--
作者:
Alvey, Paul M.;Reczek, Joseph J.;Lynch, Vincent;Iverson, Brent L.
1:1 molar mixtures of electron rich dialkoxynapthalene (Dan) and electron deficient 1,4,5,8-napthalenetetracarboxylic diimide (Ndi) derivatives form highly tunable, columnar mesophases with a dark red color due to a charge transfer absorbance derived from alternating face-centered stacking. Certain Dan-Ndi mixtures undergo a dramatic color change from dark red to an almost colorless material upon crystallizing from the mesophase. Macroscopic morphology of the solid is not changed during this process. In order to investigate the origins of this interesting thermochromic behavior, Dan and Ndi side chains were systematically altered and their 1:1 mixtures studied. We have previously speculated that the presence or absence of steric interactions due to side chain branching on the aromatic units controlled the level of color change associated with crystallization. Results from the present study further refine this conclusion including a key crystal structure that provides a structural rationale for the observed results.
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