期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 30, 页码 10184-10187出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b04484
关键词
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资金
- Bundesministerium fur Bildung and Forschung (BMBF) [03Z2EN11, 03Z2EN512]
Two-photon excitation provides high spatial resolution in three dimensions of the corresponding chemical or physical processes, allowing submicrometer structuring in stereolithography and three-dimensional (3D) microfabrication. While studying two-photon structuring applications, we observed an undescribed phenomenon in photochemistry that dictates reactivity of maleimide groups in two-photon mode. A low-absorbance transition formerly ignored in classical photochemistry has been found for maleimides. This transition was assigned to symmetry-breaking donor acceptor complex formation, which revealed a formally forbidden pathway in [2+2] cycloaddition reactions of maleimide moieties. This synthetic pathway allowed for the creation of hydrogel materials under physiological conditions at low laser excitation energy (0.1 J/cm(2) at 800 nm) without the use of photoinitiators, which makes it truly two-photon click chemistry.
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