A new sensitive chemical actinometer for time-resolved and continuous photochemistry: the DCM styrene dye
✍ Scribed by J.C. Mialocq; X. Armand; S. Marguet
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 600 KB
- Volume
- 69
- Category
- Article
- ISSN
- 1010-6030
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✦ Synopsis
A new chemical actinometer is presented with improved sensitivity, precision and reproducibility with respect to potassium ferrioxalate. Based on the analytical measurement of the cis-isomer formation of a widely used styreniclaser dye, 4-dicyanomethylene-2-methyl-6-[p-(dimethylamino)stylyl]-4H-pyran (DCM) upon photoexcitation, this actinometer is convenient for continuous photolysis and time-resolved laser or flashlamp photolysis studies at wavelengths greater than 410 nm. The DCM tram-k photoisomerization efficiency has been investigated upon continuous photolysis at 462 nm and upon nanosecond laser photolysis at 532 nm. The DCM trans-eis photoisomerization quantum yield depends on the solvent polarity, @@ICI,) =0.28&0.02 and @(CH,OH) = (2.22 f 0.05). lo-' in chloroform and methanol respectively.