期刊
ADVANCED MATERIALS
卷 29, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701220
关键词
2D polymers; diazaanthracene dimerization; excimer fluorescence; molecular papers; thermal retro-reaction
类别
资金
- Deutsche Forschungsgemeinschaft
A Langmuir-Blodgett film consisting of a dense array of trifunctional monomers bearing three 1,8-diazaanthracene units is polymerized at an air/water interface or after transfer on solid substrates. The transfer does not affect the excimer fluorescence of the film, indicating that the monomers' packing with their diazaanthracene units stacked face-to-face is retained-a prerequisite for successful polymerization. The monomer film can be polymerized in confined areas on solid substrates by UV irradiation with a confocal microscope laser. The underlying chemistry of the polymerization, a [4+4]-cycloaddition of the diazaanthracene units, leads to disappearance of the fluorescence in the irradiated regions which enables writing into the monolayer on a mu m scale-thus the term molecular paper. The reaction can be reversed by heating which leads to a recovery of the fluorescence and to erasing of the writing. Alternative pathways for this phenomenon are discussed and control experiments are conducted to rule them out.
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