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- Title
Enhancement of association of organic molecules on silica gel by surface water: surface photoreaction of stilbene.
- Authors
Hasegawa, Tadashi; Usuba, Kakeru; Kondo, Soichiro; Maeda, Yutaka
- Abstract
Here, we show that association of stilbene molecules is facilitated by water on silica gel because of hydrophobic interaction and photodimerization becomes the main photochemical process. Irradiation of trans-stilbene ( t-1) on silica gel gives cis-stilbene ( c-1), phenanthrene ( 2), benzaldehyde ( 3), and dimers r-ctt-4 and r-tct-4. The yields of the dimers increase and those of 2 and 3 decrease with an increase in the amount of t-1 loaded on silica gel. Atmospheric oxygen is responsible for the formation of 2 and 3. The yields of the dimers also increase with an increase in the water on a silica-gel surface and change drastically at the point where the percentage of water to silica gel is around 25 wt%. All active sites on a silica-gel surface would be covered completely with 25 wt% of water.
- Subjects
STILBENE; SILICA gel; IRRADIATION; PHOTOCHEMISTRY; PHENANTHRENE; BENZALDEHYDE
- Publication
Environmental Chemistry Letters, 2008, Vol 6, Issue 2, p107
- ISSN
1610-3653
- Publication type
Article
- DOI
10.1007/s10311-007-0116-z