The Reactions of Acetylene Photosensitized by Cd(3P1)

Tsunashima, S.; Sato, Shin

doi:10.1246/bcsj.41.2281

Cited by 11 publications

(4 citation statements)

References 18 publications

(5 reference statements)

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“…6) increases to a maximum at about 10 Torr of acetylene and then decreases with further increase of acetylene, indicating the formation of another product, probably benzene, which has been detected by Tsukada and Shida (4 in competition with the formation of diacetylene From reactions [4] and [5] we obtain where +°C,H2 is the quantum yield of diacetylene formation without Hz and +c,l,2 is that with Hz. The plot, +0c,H2/+C,Hz against (H2)/(CzH2) gives a straight line with the slope k4/kj, as shown in Fig.…”

Section: Prinzary Processsupporting

confidence: 57%

“…9. The least-squares analysis of the plot gives k4/kj = 0.00775 + 0.00068, that is, reaction [5] is 130 +-11 times as fast as reaction [4]. Similar plots have been made for CH4, C2H6, and C3H8.…”

Section: Prinzary Processmentioning

confidence: 54%

“…Hence it is probable that cis 'A2 or trczr~s ' A, is formed by absorption both at 1470 and 1849 r\. On the other hand, in the Hg and Cd sensitized reactions mainly traru3B,, or cis 'B2 may be formed, since in these reactions very little diacetylene is detected as a product (5,6).…”

Section: Prinzary Processmentioning

confidence: 99%

“…On the other hand, in the Titan atmosphere where methane is abundant, the production of C,H from acetylene photolysis and the subsequent reaction with methane is an important destruction mechanism of methane. Strobe1 estimates (14) processes [5] to [4]. See text.…”

Section: Photolysis Of Czhz-hz C2hz -Hydrocarborz Mixtures Photochemmentioning

confidence: 99%

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Photochemistry of acetylene

Okabe¹

1983

Can. J. Chem.

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Photochemical and fluorescence studies of acetylene initiated by absorption of light in the vacuum ultraviolet have been described. The photochemical primary process consists of (1) the formation of C2 + H2, (2) the production of C2H + H, and (3) the formation of a metastable acetylene. The quantum yield of process (1) is about 0.1 and that of process (2) is 0.06 at 1849 Å and 0.3 at 1470 Å. The metastable acetylene either reacts with ground state acetylene to produce diacetylene or is deactivated by collisions with the walls, inert gases, or by fluorescence. A quasicontinuous emission is observed in the 4000 to 6000 Å region when acetylene is exposed to incident wavelengths below 1305 Å. This emission is ascribed to an electronically excited ethynyl radical. The rates of reaction C2H + H2 → C2H2 + H and C2H + RH → C2H2 + R (RH = CH4, C2H6, C3H8) have been measured. The photochemistry of acetylene in the Jovian and Titan atmospheres is briefly discussed.

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Section: Prinzary Processsupporting

confidence: 57%

Section: Prinzary Processmentioning

confidence: 54%

Section: Prinzary Processmentioning

confidence: 99%

Section: Photolysis Of Czhz-hz C2hz -Hydrocarborz Mixtures Photochemmentioning

confidence: 99%

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Photochemistry of acetylene

Okabe¹

1983

Can. J. Chem.

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Unimolecular decomposition of chemically activated methylallylether

Ibuki

Takezaki

1977

Int J of Chemical Kinetics

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The unimolecular decomposition of chemically activated methylallylether (XIAE) formed by the cross combination of methoxymethyl and vinyl radicals was studied in the gas phase. The experimentally determined rate constant was found to be 1.11 X lo8 sec-1 at 9.6"C for the decomposition of MAE into propene and formaldehyde. The decomposition of MAE via the six-center retro-"ene" type transition state is analyzed by using the RRKM unimolecular reaction theory. For the molecular parameter assignments of energized MAE, a model which contains one internal rotational mode is supported, and MAE decomposition is characterized by a tight complex model. The best agreement between experimental and theoretical results was found when a critical energy of 40.1 kcal/mol was used.

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Hydrogen atom initiated chemistry

Hong

Becker

1979

J Mol Evol

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H atoms have been created by the photolysis of H2S. These then initiated reactions in mixtures involving acetylene-ammonia-water and ethylene-ammonia-water. In the case of the acetylene system, the products consisted of two amino acids, ethylene and a group of primarily cyclic thio-compounds, but no free sulfur. In the case of the ethylene systems, seven amino acids, including an aromatic one, ethane, free sulfur, and a group of solely linear thio-compounds were produced. Total quantum yields for the production of amino acids were approximately 3 x 10(-5) and approximately 2 x 10(-4) with ethylene and acetylene respectively as carbon substrates. Consideration is given of the mechanism for the formation of some of the products and implications regarding planetary atmosphere chemistry, particularly that of Jupiter, are explored.

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The Reactions of Acetylene Photosensitized by Cd(3P1)

Cited by 11 publications

References 18 publications

Photochemistry of acetylene

Photochemistry of acetylene

Unimolecular decomposition of chemically activated methylallylether

Hydrogen atom initiated chemistry

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