FREE RADICAL RECOMBINATION IN THE PHOTOLYSIS OF ACETONE

1955 ◽  
Vol 33 (5) ◽  
pp. 750-754 ◽  
Author(s):  
S. N. Naldrett

(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.

1968 ◽  
Vol 46 (16) ◽  
pp. 2693-2697 ◽  
Author(s):  
R. Payette ◽  
M. Bertrand ◽  
Y. Rousseau

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.


1971 ◽  
Vol 24 (12) ◽  
pp. 2593 ◽  
Author(s):  
JW Clark-Lewis ◽  
K Moody

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).


Author(s):  
Xiaoqing Liu ◽  
Wenbo Dai ◽  
Qian Junjie ◽  
Yunxiang Lei ◽  
Miaochang Liu ◽  
...  

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...


Author(s):  
Wirya Sarwana ◽  
Akihiko Anzai ◽  
Daichi Takami ◽  
Akira Yamamoto ◽  
Hisao Yoshida

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...


2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Mark A. Newton ◽  
Davide Ferri ◽  
Grigory Smolentsev ◽  
Valentina Marchionni ◽  
Maarten Nachtegaal

1998 ◽  
Vol 95 (1) ◽  
pp. 71-89 ◽  
Author(s):  
C.R. Timmel ◽  
U. Till ◽  
B. Brocklehurst ◽  
K.A. Mclauchlan ◽  
P.J. Hore

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