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Laser Irradiation of Monomeric Acetylene and the T‐Shaped Acetylene Dimer in Xenon and Argon Matrices
Author(s) -
Maier Günther,
Lautz Christian
Publication year - 1998
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/(sici)1099-0690(199805)1998:5<769::aid-ejoc769>3.0.co;2-s
Subject(s) - xenon , chemistry , irradiation , acetylene , argon , photochemistry , matrix isolation , dimer , matrix (chemical analysis) , laser , organic chemistry , optics , physics , chromatography , nuclear physics
Irradiation of acetylene ( 4 ) in an argon matrix with an ArF laser (λ = 193 nm) yields the ethynyl radical C 2 H · ( 5 ) and C 2 ( 6 ). If the same wavelength is used to irradiate 4 in a xenon matrix, only the infrared signal of the compound Xe–C 2 ( 7 ) can be detected. The same band is found on irradiation at λ = 248 nm (KrF laser) in a xenon matrix, despite the fact that acetylene ( 4 ) does not absorb light of this wavelength. Irradiation of the T‐shaped acetylene dimer 9 in an argon or xenon matrix at λ = 193 nm yields butadiyne ( 11 ) and vinylacetylene ( 12 ). However, irradiation with a KrF laser (λ = 248 nm) in a xenon matrix additionally yields cyclobutadiene ( 13 ). The dependence of the mechanisms of the fragmentation and dimerization of acetylene ( 4 ) on the matrix material is discussed.