✦ LIBER ✦

Temperature dependent near UV molar absorptivities of several small aldehydes in aqueous solution

✍ Scribed by Yuk Y. Sham; Jeffrey A. Joens

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 351 KB
Volume: 51
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(94)e0089-s

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✦ Synopsis

Temperature-dependent molar absorptivities are reported for benzaldehyde, acrolein, isobutyraldehyde, pentanal, and hexanal in aqueous solution. With the exception of acrolein, molar absorptivities are given at eight temperatures in the range 6.5-69.5°C for wavelengths greater than 200 nm, a spectral resolution of 2.0 nm, and a spacing of 2.5 nm. For acrolein, data are given over a more limited range of temperatures and wavelengths. For benzaldehyde and acrolein, no hydration occurs, as expected, and only small changes in the shape and intensity of the spectrum with temperature are observed. For the other three aldehydes, the hydration reaction

is the major source for the observed change in intensity with temperature. Based on these changes, the following thermodynamic parameters are obtained for the hydration reaction at T= 25°C: isobutyraldehyde,

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