By Douglas C. Neckers, David H. Volman, G?nther von B?nau

Surroundings the velocity for development and innovation . . .

ADVANCES IN PHOTOCHEMISTRY

greater than an easy survey of the present literature, Advances in Photochemistry deals serious reviews written via the world over well-known specialists. those pioneering scientists provide precise and sundry issues of view of the present information. Their articles are hard in addition to provocative and are meant to stimulate dialogue, advertise additional learn, and inspire new advancements within the field.

during this volume

Cis-Trans Photoisomerization of Stilbenes and Stilbene-Like Molecules Helmut Gorner and Hans Jochen Kuhn

AFM and STM in Photochemistry together with Photon Tunneling Gerd Kaupp

Photophysical and Photochemical approaches of Semiconductor Nanoclusters Ying Wang

The query of synthetic Photosynthesis of Ammonia on Heterogeneous Catalysts Julian A. Davies, David L. Boucher, and Jimmie G. EdwardsContent:

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Extra info for Advances in Photochemistry, Volume 19

Example text

2-DIARYLETHYLENES 41 hinders twisting of the molecule about the olefinic double bond, thereby reducing the probability of deactivation by trans -+ cis isomerization. , 1,l-diphenyl-, triphenyl-, and tetraphenylethylene) show a remarkable blue-shift of If on going to low temperatures and/or high viscosities [82, 243, 244, 2481. trans-Cyano- and trans-nitrostilbenes generally emit at longer wavelengths (Table 10). , amino or dialkylamino) causes a large Stokes shift [l2, 156, 1571. With increasing solvent polarity Af undergoes a strong bathochromic shift [85, 112, 152, 160, 1771.

With 3,4-dimethylbenzophenone the isomerization of stilbene was probed in zeolites [216]. The cis& trans isomerization of stilbene in a polystyrene film was ascribed to sensitizing impurities [217]. Only a few studies concerning the temperature dependence of sensitized c i s e t r a n s isomerization have been reported [2, 108, 184, 196, 2361. A small effect of elevated temperature on ( [ ~ ] / [ t ] ) ~ ~for ~ , stilbene has been found [2,196]; at 59°C the photostationary state is somewhat richer in cis isomer than at 28°C if sensitizers with E , > 222kJmol-' are used.

254 280 313 313 313 313 313 313 313 313 313 254 294 280 313 313 313 254 296 313 313 313 366 313 313 366 366 366 365 366 366 366 366 366 366 410 366 366 280 313 313 105 105,295 7, 12 114 7 9, 296 114 12, 187 12 114 12, 187 105, 295 105 105,295 I , 12 114 114 105, 295 105 12 12 121 12 85 85 291 85, 297 112 253 85 I18 118 297 118, 297 297 159 152 152 299 299 299 44 C I S - T R A N S PHOTOlSOMERIZATION Ob' STILBENES donating group, for example, 4,4'-NDS in solvents of lower polarity [85, 152, 157, 1591.

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