Photooxidation of n-heptanal in air: Norrish type I and II processes and quantum yield total pressure dependency
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2002
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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.
Ključne reči:
Aldehydes / Photoexcitations / Air / Photooxidation / Quantum yieldIzvor:
Journal of the Chemical Society, Perkin Transactions 2, 2002, 2, 1, 135-140Izdavač:
- Royal Society of Chemistry
Institucija/grupa
IHTMTY - 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 . .