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Fabrication of Robust Multilayer Films by Triggering the Coupling Reaction between Phenol and Primary Amine Groups with Visible Light Irradiation.
Fabrication of Robust Multilayer Films by Triggering the Coupling Reaction between Phenol and Primary Amine Groups with Visible Light Irradiation.
We prepared robust cross-linked (x-linked) multilayer
films under visible light irradiation with the catalysis of a Ru(II) complex.
The x-linking is achieved by the coupling reaction between phenol group and
primary amine group within the self-assembled multilayer films that were
prepared beforehand. Three kinds of polymers, i.e., poly(4-vinylphenol),
poly(allylamine) and poly(ethyleneimine), were selected as the model system to
illustrate the concept of this strategy. Upon visible light irradiation, the
chemical stability of the x-linked films towards solution etching was greatly
enhanced. In previous studies, horseradish
peroxidase (HRP) is often
utilized to catalyze the C-C, C-O and C-N coupling structures, which is
useful to prepare polymers, capsules and bulk hydrogels. We also tried to
prepare the x-linked films by the catalysis of HRP. The comparison of the two
methods suggests that the Ru(II) complex method is more ideal for fabricating
x-linked films. In addition, the photo-triggered chemical reaction within the
films was confirmed by the solid-state13C-NMR,
XPS and FT-IR measurements. Without UV light irradiation or thermal treatment,
this strategy brings many advantages. It is anticipated that this approach can
be easily extended to the applications of the biological related fields in the
future.
