Following a photoinduced reconstructive phase transformation and its influence on the crystal integrity: powder diffraction and theoretical study.
In the course of solid-state photoreactions, a single crystal (SC) of the reactant can be transformed into an SC of the product or it can lose crystallinity and become amorphous. In-between these two scenarios exist the reconstructive phase transformations, where upon irradiation, the reactant SC becomes a powder or an SC with increased mosaicity. We present a detailed description of reconstructive photodimerization, where the structural changes are directly correlated with the disintegration process. The kinetics of the reaction is explained by two kinetic regimes, forming an autocatalytic autoinhibition photoreaction set with high quantum yield. In addition, the photoreaction pathways were studied theoretically.
Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany). t.runcevski@fkf.mpg.de.
Tomče
T
Runčevski
Marina
M
Blanco-Lomas
Marco
M
Marazzi
Marcos
M
Cejuela
Diego
D
Sampedro
Robert E
RE
Dinnebier
excited states; oxazolones; phase transformations; photodimerization; powder diffraction