X-ray observation of a transient hemiaminal trapped in a porous network

Takehide Kawamichi, Tsuyoshi Haneda, Masaki Kawano () and Makoto Fujita ()
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Takehide Kawamichi: School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Tsuyoshi Haneda: School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Masaki Kawano: School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Makoto Fujita: School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Nature, 2009, vol. 461, issue 7264, 633-635

Abstract: Chemical reactions X-rayed For the structural analysis of stable crystalline compounds, X-ray crystallography is the method of choice. But unstable reaction intermediates are beyond its capabilities. Kawamichi et al. have now cracked that problem by designing a robust porous network material that acts as a 'reaction medium', with the chemical transformations taking place within the pores. X-ray analysis can then be used to take 'snapshots' of different stages of the reaction. In a proof of principle experiment the structure of a porous network was determined first with an aromatic amine embedded in it, then after an aldehyde substrate was diffused into the material to form a hemiaminal intermediate and finally when the imine product had formed.

Date: 2009
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DOI: 10.1038/nature08326

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