科研之友
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摘要
The reactivity of phenothiazine (PTZ) in PTZ-laponite mixtures, prepared by three different methods, was investigated using diffuse reflectance UV-visible absorption spectroscopy (DRUVv) at room temperature, T = 293 K. It was shown that the formation of different charge separated states (CSS) could be observed in PTZ-laponite mixtures depending on the procedure of preparing the mixtures. PTZ(.+) radical cations, adsorbed on the external surface of laponite, and PTZ(2+) di-cations, intercalated inside the interlayer space, occurred in PTZ-laponite mixtures based on laponite dehydrated under argon. In PTZ-laponite mixtures, based on hydrated laponite (dry-air state), the PTZ-species could be adsorbed only on the external surface of laponite in the form of PTZ(.+) radical cations. It is also shown that, using a hydrated powder of laponite with the help of a swelling agent (acetone), PTZ can penetrate into the interlayer space and can be stabilized as a di-cation. The proposed schemes of spontaneous ionization of PTZ are in agreement with the data of wide angle X-ray diffraction analyses. The observed differences in formation of charged separated states in PTZ-laponite mixtures, prepared using different methods, reflect the effects of confinement on the structure and mobility of adsorbed and intercalated PTZ species.
- 出版日期2014-1-6
