Examination of fatty acid exchanged layered double hydroxides as supports for photochemical assemblies
- Ohio State Univ., Columbus, OH (United States)
The incorporation of titanium oxide into the interlayers of a myristic acid exchanged lithium aluminum layered double hydroxide was done by partitioning of titanium butoxide into the interlayer, followed by hydrolysis under ambient conditions. Upon excitation with near-ultraviolet radiation in the presence of viologens and thiocyanate ion, viologen radical is formed. Cationic viologen radicals were held onto the solid surface, indicating that the titanium oxide is negatively charged. [Tetrakis(4-carboxyphenyl)-porphyrinato]zinc(II)(ZnTPPC) was ion exchanged into the interlayers. Electronic spectral changes upon incorporation suggest that the ZnTPPC is in the monomeric form. In the presence of ethylenediamine tetraacetic acid (EDTA) as a sacrificial electron donor, the interlayer ZnTPPC was capable of reducing viologen molecules in solution upon visible radiation. Yields of viologen radical were higher for neutral viologens than cationic viologens, presumably due to the restricted access of cations into the interlayer space. The sensitization of the titanium oxide by ZnTPPC was also possible, resulting in viologen radicals upon visible light excitation. The anionic nature of the titanium oxide was exploited to confirm that sensitization was indeed taking place. 27 refs., 12 figs., 2 tabs.
- OSTI ID:
- 199395
- Journal Information:
- Langmuir, Vol. 12, Issue 2; Other Information: PBD: 24 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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