Abstract
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 styrenic laser dye, 4-dicyanomethylene-2-methyl-6-[ p -(dimethylamino)styryl]-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 trans—cis photoisomerization efficiency has been investigated upon continuous photolysis at 462 nm and upon nanosecond laser photolysis at 532 nm. The DCM trans—cis photoisomerization quantum yield depends on the solvent polarity, Φ(CHCl 3 )=0.28±0.02 and Φ(CH 3 OH)= (2.22±0.05) · 10 −2 in chloroform and methanol respectively.
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