Formation of selectivity in molecular isomerization by the IR multiphoton excitation

Autor:	Evgeny A. Ryabov, S. V. Pigul’skii, V. B. Laptev
Rok vydání:	2011
Předmět:	chemistry.chemical_compound Chemistry Ketene Molecule Physical and Theoretical Chemistry Selectivity Photochemistry Isomerization Chemical reaction Fluoride Spectral line Excitation
Zdroj:	High Energy Chemistry. 45:335-341
ISSN:	1608-3148 0018-1439
DOI:	10.1134/s0018143911040096
Popis:	The formation mechanism of the selectivity of IR laser isomerization induced by vibrational multiphoton excitation is considered. The effective and highly selective isomerization of perfluorodimethyl ketene (CF3)2C=C=O into perfluoromethacrylic acid fluoride F2C=C(CF3)COF and perfluorocyclobutene into perfluorobutadiene upon pulse irradiation with a CO2 laser and its second harmonic was performed. The conversion of (CF3)2C=C=O into F2C=C(CF3)COF was higher than 99%. A record-breaking conversion of 99.8% of the parent substance into the isomer was achieved in the case of perfluorocyclobutene isomerization into perfluorobutadiene. It was shown that the high selectivity of the laser-induced chemical reactions is mainly associated with the different levels of the vibrational excitation of the parent molecules and their isomers. The latter is due to the difference in the IR absorption spectra of different isomers, which allows for the excitation of the necessary component with a high selectivity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::99bd7d306af7afd12395ad2c69d0ff2b https://doi.org/10.1134/s0018143911040096 Zobrazit plný text záznamu Plný text ve formátu PDF