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Ethynyl C2H

As with methane, the photolysis of acetylene and subsequent chemistry involving the ethynyl (C2H) radical plays an important role in establishing the hydrocarbon balance in the atmospheres of the outer planets and their moons [4, 311]. The ethynyl radical is also an important reactive intermediate in combustion processes both it and acetylene have been implicated in soot formation, as well as in some models of diamond growth by chemical vapor deposition methods. [Pg.273]

A number of hydrocarbon radicals having multiple bonds at the radical centre have also been trapped in inert matrices and studied by IR spectroscopy. Thus, ethynyl radical was obtained by vacuum UV photolysis (9) of matrix-isolated acetylene (Shepherd and Graham, 1987) as well as when acetylene and argon atoms excited in a microwave discharge were codeposited at 12 K (Jacox and Olson, 1987). An appearance of diacetylene bands was observed when the matrices were warmed up, while the absorptions of the radical C2H disappeared. Detailed isotopic studies of D-and C-labelled ethynyl radicals showed a surprisingly low frequency of the C=C bond stretching vibration at 1846 cm instead of c.2100cm for a true C=C triple bond (the band at 2104 cm was attributed to the... [Pg.35]

Acetylene is the simplest unsaturated hydrocarbons and as such an understanding of its photochemistry is important. The reactions of ethynyl radicals (C H) are important in combustion as well as in the photochemistry of Jupiter and Titan atmospheres, although, unfortunately, C2H radical has apparently only very weak and complex absorption spectra in the visible and ultraviolet region and no LIF has been found. [Pg.79]

Ru5((15-C2) (fi-PPh2)2(CO)u(py)2 (338). This complex was obtained from 327 and pyridine together with the ethynyl cluster Ru6(p6-C2H) (p3-NCsII4)(p-PPh2)2(p-CO)(CO) 12 (339) and other products formed by metallation of a pyridine ligand without cleavage of the P-C(sp) bond.525,526... [Pg.369]

The photolysis of solid acetylene has been examined briefly. Cochran et observed the esr spectra of species formed by the photolysis of acetylene by light from a hydrogen discharge. No signal was found for the photolysis of acetylene which was already deposited, but the presence of C2H3 and C2H was observed when the photolysis was conducted during deposition. No evidence for hydrogen atoms was found. The authors attributed the ethynyl and vinyl radicals to the reaction... [Pg.97]

H. F. Reaction of the ethynyl radical, C2H, with methylacetylene, CH3CCH, under single collision conditions Implications for astrochemistry. J. Chem. Phys. 2001, 114, 3476-3487. [Pg.321]

Lee, S., Samuels, D.A., Hoobler, R.J., Leone, S.R. (2000) Direct Measurements of Rate Coefficients for the Reaction of Ethynyl Radical (C2H) with C2H2 at 90 and 120 K Using a Pulsed Laval Nozzle Apparatus. J. Geophys. Res. 105 15085-15090. [Pg.127]

Hoobler RJ, Leone SR. (1999) Low-temperature rate coefficients for reactions of the ethynyl radical (C2H) with C3H4 isomers methylacetylene and allene. J. Phys. Chem. A. 103 1342 1346. [Pg.225]


See other pages where Ethynyl C2H is mentioned: [Pg.469]    [Pg.70]    [Pg.222]    [Pg.223]    [Pg.240]    [Pg.260]    [Pg.2248]    [Pg.2363]    [Pg.469]    [Pg.70]    [Pg.222]    [Pg.223]    [Pg.240]    [Pg.260]    [Pg.2248]    [Pg.2363]    [Pg.647]    [Pg.606]    [Pg.1175]    [Pg.220]    [Pg.237]    [Pg.64]    [Pg.47]    [Pg.293]    [Pg.314]    [Pg.35]    [Pg.1546]    [Pg.98]    [Pg.1671]    [Pg.215]   


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