Dilute mixtures of n-heptanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were pent-1-ene, CO, vinyl alcohol and ethanal. The photolysis rates and the absolute quantum yields φ were found to be slightly dependent on the total pressure. At 100 Torr, φ100 = 0.36±0.03, whereas at 700 Torr the total quantum yield was φ700 = 0.31± 0.01. The results may be explained by the collisional deactivation of photoexcited molecules. Two decomposition channels were identified: the radical channel C6H13CHO → C6H13 + HCO, and the molecular channel C6H13CHO → C5H10 + CH2=CHOH, having the absolute quantum yields of 0.031 and 0.118 at 700 Torr. The product CH2 = CHOH tautomerizes to ethanal.
Keywords:
Aldehydes / Photoexcitations / Air / Photooxidation / Quantum yield
Source:
Journal of the Chemical Society, Perkin Transactions 2, 2002, 2, 1, 135-140
TY - JOUR
AU - Tadić, Jovan M.
AU - Juranić, Ivan O.
AU - Moortgat, Geert Karel
PY - 2002
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4426
AB - Dilute mixtures of n-heptanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were pent-1-ene, CO, vinyl alcohol and ethanal. The photolysis rates and the absolute quantum yields φ were found to be slightly dependent on the total pressure. At 100 Torr, φ100 = 0.36±0.03, whereas at 700 Torr the total quantum yield was φ700 = 0.31± 0.01. The results may be explained by the collisional deactivation of photoexcited molecules. Two decomposition channels were identified: the radical channel C6H13CHO → C6H13 + HCO, and the molecular channel C6H13CHO → C5H10 + CH2=CHOH, having the absolute quantum yields of 0.031 and 0.118 at 700 Torr. The product CH2 = CHOH tautomerizes to ethanal.
PB - Royal Society of Chemistry
T2 - Journal of the Chemical Society, Perkin Transactions 2
T1 - Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency
VL - 2
IS - 1
SP - 135
EP - 140
DO - 10.1039/b106476m
ER -
@article{
author = "Tadić, Jovan M. and Juranić, Ivan O. and Moortgat, Geert Karel",
year = "2002",
abstract = "Dilute mixtures of n-heptanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were pent-1-ene, CO, vinyl alcohol and ethanal. The photolysis rates and the absolute quantum yields φ were found to be slightly dependent on the total pressure. At 100 Torr, φ100 = 0.36±0.03, whereas at 700 Torr the total quantum yield was φ700 = 0.31± 0.01. The results may be explained by the collisional deactivation of photoexcited molecules. Two decomposition channels were identified: the radical channel C6H13CHO → C6H13 + HCO, and the molecular channel C6H13CHO → C5H10 + CH2=CHOH, having the absolute quantum yields of 0.031 and 0.118 at 700 Torr. The product CH2 = CHOH tautomerizes to ethanal.",
publisher = "Royal Society of Chemistry",
journal = "Journal of the Chemical Society, Perkin Transactions 2",
title = "Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency",
volume = "2",
number = "1",
pages = "135-140",
doi = "10.1039/b106476m"
}
Tadić, J. M., Juranić, I. O.,& Moortgat, G. K.. (2002). Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency. in Journal of the Chemical Society, Perkin Transactions 2
Royal Society of Chemistry., 2(1), 135-140.
https://doi.org/10.1039/b106476m
Tadić JM, Juranić IO, Moortgat GK. Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency. in Journal of the Chemical Society, Perkin Transactions 2. 2002;2(1):135-140.
doi:10.1039/b106476m .
Tadić, Jovan M., Juranić, Ivan O., Moortgat, Geert Karel, "Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency" in Journal of the Chemical Society, Perkin Transactions 2, 2, no. 1 (2002):135-140,
https://doi.org/10.1039/b106476m . .
