UV absorption cross-sections of a series of vinyl ethers

Abstract: UV absorption cross-sections of six vinyl ethers (ethyl vinyl ether, 1,4-butanediol divinyl ether, isobutyl vinyl ether, cyclohexyl vinyl ether, 4-hydroxybutylvinyl ether and diethyleneglycol divinyl ether) have been determined in the gas phase between 190 and 230nm at 303±2K and pressures up to the corresponding saturation vapor pressures. The main band maxima of the vinyl ethers are below 200nm with values under 8×10−17 cm2 molecule−1. The absorption vanishes above 225nm with values of σ smaller than 1×10−21 cm2 molecule−1. Weak, overlaying vibrational progressions with spacings of 1400cm−1 are observed for the alkyl vinyl ethers and are less pronounced for vinyl ethers with an extra O atom. Shifts of the positions and intensities are discussed on the basis of the differences in the chemical structure of this series. [Copyright &y& Elsevier]