期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 6, 页码 1235-1242出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc02444c
关键词
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资金
- Region Alsace fellowship
- Agence Nationale pour la Recherche [ANR-11-BS08-0001]
- Agence Nationale de la Recherche (ANR) [ANR-11-BS08-0001] Funding Source: Agence Nationale de la Recherche (ANR)
A perylene bisimide organogelator is shown to behave as a reversible stimuli responsive material: thermal annealing and contact with organic non solvents allow to switch back and forth between a green J-type (Form I) and a red H-type (Form II) aggregate in thin films and powders of a N, N'-substituted H-bonding perylenebisimide (PBI-C10). Both, Form I and II were characterized by transmission electron (low dose high-resolution and electron diffraction) and atomic force microscopies, UV-vis and FTIR spectroscopies. The Form I -> Form II transformation implies a redistribution of inter-molecular H-bonds between PBI molecules that form columnar stacks in Form I and supramolecular helices with enhanced long-range stacking in Form II. The reverse transformation is triggered by a contact of Form II films with H-bonding organic non solvents e. g. linear alcohols. It is proposed that solvent molecules diffusing in the Form II films can disrupt long-range H-bonding within helical stacks of Form II. Accordingly, PBI-C10 is shown to behave as a functional material responding successively to thermal and molecular stimuli.
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