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Photochemical behaviour of acrolein

Considerable polymerization could be observed , the quantum yield of which (determined by pressure measurement) varied significantly with the wavelength viz. 0.3 (3660 A), 0.5 (3130 A), 1 (3020 A), 10 (2804 A), 19 (2654 and 2537 A). According to Placet et a correlation exists between the quantum yield of polymerization and the character of the absorption of radiation. Thompson and Linnett assumed that polymerization is the result of the interaction between excited and normal molecules. However, the high quantum yields observed at short wavelengths favour the free radical mechanism .  [Pg.305]

At room temperature, Thompson and Linnett found the decomposition quantum yield to be 10 and 10 at 3665 and 3135 A, respectively. Placet et al. observed photolysis only with unliltered light of the mercury arc. To explain the photochemical stability of acrolein, Thompson and Linnett assume that delocalization of energy rapidly occurs in the excited molecule formed as the result of light absorption. The conjugated double bond system of the molecule may be responsible for the rapid internal degradation of the energy. [Pg.305]

The following primary processes may be assumed on the basis of the results obtained in the direct and the mercury-sensitized photolyses [Pg.305]


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