FREE RADICAL RECOMBINATION IN THE PHOTOLYSIS OF ACETONE

(CH3CO)2-1-C14 (I) was prepared by irradiating (CH3)2CO in the presence of CH3I-C14. Acetone was then irradiated at room temperature with light of 2537 Å in the presence of (I). Radioactivity was found in all products which contained methyl groups but not in any carbon monoxide product. The amount of carbon-14 ultimately found in acetone confirms that the quantum efficiency of the primary photolytic process is nearly unity and that extensive recombination of methyl and acetyl radicals to form acetone is responsible for the low over-all quantum efficiency of decomposition.

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Primary process(es) in the mercury-photosensitized decomposition of dimethyl ether at 2537 Å

Canadian Journal of Chemistry ◽

10.1139/v68-443 ◽

1968 ◽

Vol 46 (16) ◽

pp. 2693-2697 ◽

Cited By ~ 4

Author(s):

R. Payette ◽

M. Bertrand ◽

Y. Rousseau

Keyword(s):

Carbon Monoxide ◽

Quantum Yield ◽

Light Intensity ◽

Dimethyl Ether ◽

Molecular Hydrogen ◽

Room Temperature ◽

Primary Process ◽

Methyl Radicals ◽

Hydrogen Atoms ◽

Radical Recombination

The mercury-photosensitized decomposition of dimethyl ether has been studied at room temperature and at pressures ranging from 10 to 200 Torr.The formation of an excited dimethyl ether (DME) molecule has been verified by following the rates of formation of methane, ethane, and carbon monoxide with various ether pressures.The study of the variation of the quantum yield of molecular hydrogen formation with absorbed light intensity at high ether pressures has shown that the primary process involves the dissociation of ether molecules into hydrogen atoms and methoxy methyl radicals:[Formula: see text]The results presented in this paper indicate that the excited DME molecule can originate in a radical recombination between hydrogen atoms and methoxy methyl radicals.

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Heterocyclic compounds from alloxan and amines. XIII. Phenazine freeradical betaines and their dehydro dimers derived from alloxan and 2-aminodiphenylamines

Australian Journal of Chemistry ◽

10.1071/ch9712593 ◽

1971 ◽

Vol 24 (12) ◽

pp. 2593 ◽

Cited By ~ 9

Author(s):

JW Clark-Lewis ◽

K Moody

Keyword(s):

Free Radical ◽

Heterocyclic Compounds ◽

Room Temperature ◽

Methyl Groups ◽

Stable Free Radical ◽

Deep Green

2-Amino-N-alkydiphenylamines and 2-aminotriphenylamines react with alloxan at room temperature to give green, intensely coloured, stable, free-radical betaines (dihydrophenazinioylbarbiturates). Heating the free-radical betaines alone or in a solvent gives rise to blue dimers. 3,7-Disubstitution of the phenazinioyl nucleus by methyl groups prevents formation of the blue dimers, which are therefore considered to arise by dimerization at the 3-position, followed by dehydrogenation. Dimerization of 3,7- dimethyldihydrophenazinioylbarbi- turates gives deep green 3,3?-dimers in which the 3,3?-methyl substituents prevent the dehydrogenation step entailed in the formation of the blue dehydro dimers. �� A violent explosion occurred in two instances during preparation of phenazine by oxidative sublimation of crude dihydrophenazine by Morley's method (J. chem. Soc., 1952, 4008).

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ChemInform Abstract: Free Radical Chemistry in Room-Temperature Ionic Liquids

ChemInform ◽

10.1002/chin.201237234 ◽

2012 ◽

Vol 43 (37) ◽

pp. no-no

Author(s):

Ilya A. Shkrob ◽

James F. Wishart

Keyword(s):

Ionic Liquids ◽

Free Radical ◽

Room Temperature ◽

Room Temperature Ionic Liquids ◽

Radical Chemistry ◽

Free Radical Chemistry

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Pure room temperature phosphorescence emission of organic host-guest doped system with quantum efficiency of 64%

Journal of Materials Chemistry C ◽

10.1039/d1tc00403d ◽

2021 ◽

Author(s):

Xiaoqing Liu ◽

Wenbo Dai ◽

Qian Junjie ◽

Yunxiang Lei ◽

Miaochang Liu ◽

...

Keyword(s):

Quantum Efficiency ◽

Room Temperature ◽

Room Temperature Phosphorescence ◽

Halogen Atoms ◽

System P ◽

Phosphorescence Emission

A new doped system with pure phosphorescent emission is constructed using four 1-(4-(diphenylamino)phenyl)-2-phenylethan-1-one derivatives containing halogen atoms as the guests and benzophenone as the host. That is, the doped system...

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Carbon monoxide formation as an intermediate product in photocatalytic steam reforming of methane with lanthanum-doped sodium tantalate

Catalysis Science & Technology ◽

10.1039/d1cy00264c ◽

2021 ◽

Author(s):

Wirya Sarwana ◽

Akihiko Anzai ◽

Daichi Takami ◽

Akira Yamamoto ◽

Hisao Yoshida

Keyword(s):

Carbon Monoxide ◽

Solar Energy ◽

Steam Reforming ◽

Intermediate Product ◽

Room Temperature ◽

Carbon Monoxide Formation ◽

Steam Reforming Of Methane

Photocatalytic steam reforming of methane (PSRM) has been studied as an attractive method to produce hydrogen by utilizing photoenergy like solar energy around room temperature with metal-loaded photocatalysts, where methane...

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