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Volumn 129, Issue 20, 2007, Pages 6536-6546

On the mechanism of peripentacene formation from pentacene: Computational studies of a prototype for graphene formation from smaller acenes

Author keywords

[No Author keywords available]

Indexed keywords

ATOM TRANSFER; DIHYDROPENTACENE (DHP); PERIPENTACENE; TEMPERATURE VACUUM SUBLIMATION;

EID: 34249100349     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja070392a     Document Type: Article
Times cited : (33)

References (55)
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    • An experimental study of the recombination kinetics of methyl radicals by molecular modulation spectrometry showed no observable temperature dependence. See: Parkes, D. A, Paul, D. M, Quinn, C. P. J. Chem. Soc, Faraday Trans. 1 1976, 72, 1935-1951
    • An experimental study of the recombination kinetics of methyl radicals by molecular modulation spectrometry showed no observable temperature dependence. See: Parkes, D. A.; Paul, D. M.; Quinn, C. P. J. Chem. Soc., Faraday Trans. 1 1976, 72, 1935-1951.
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    • The terms exo and endo refer to the location of the radical that would be left behind (were it not in resonance) following the abstraction of a hydrogen from the 6- or 13-position, respectively, of a hydrogenated pentacene dimer such as 1.
    • The terms exo and endo refer to the location of the radical that would be left behind (were it not in resonance) following the abstraction of a hydrogen from the 6- or 13-position, respectively, of a hydrogenated pentacene dimer such as 1.
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    • The total number of potential mechanistic pathways was determined as follows: there are two possible routes for the formation of 1 (paths A or C in Scheme 5), eight possible routes for the conversion of 1 to 4 (paths E-L in Scheme 7), and eight possible routes for the conversion of 4 to 8 (paths M-U in Scheme 8) resulting in 128 different pathways for the formation of 1 and its conversion to 8. Furthermore, 2 may be formed along paths B or D in Scheme 5, and then converted to 8 along any of the eight paths of Scheme 8 (M-U), resulting in 16 additional pathways for the formation of 8 for a total of 144.
    • The total number of potential mechanistic pathways was determined as follows: there are two possible routes for the formation of 1 (paths A or C in Scheme 5), eight possible routes for the conversion of 1 to 4 (paths E-L in Scheme 7), and eight possible routes for the conversion of 4 to 8 (paths M-U in Scheme 8) resulting in 128 different pathways for the formation of 1 and its conversion to 8. Furthermore, 2 may be formed along paths B or D in Scheme 5, and then converted to 8 along any of the eight paths of Scheme 8 (M-U), resulting in 16 additional pathways for the formation of 8 for a total of 144.
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    • Different combinations of 40 separate reactions (20 forward and 20 reverse) are able to account for each of the 144 pathways leading to the formation of 6,6′-di(pentacenyl). For completeness, the possibility of hydrogen abstraction from P by 6PR and subsequent addition of 6PR to P, as proposed by Roberson et al., was also taken into account in the kinetic modeling, as were the corresponding reverse reactions. A total of 44 reactions were, therefore, modeled simultaneously.
    • Different combinations of 40 separate reactions (20 forward and 20 reverse) are able to account for each of the 144 pathways leading to the formation of 6,6′-di(pentacenyl). For completeness, the possibility of hydrogen abstraction from P by 6PR and subsequent addition of 6PR to P, as proposed by Roberson et al., was also taken into account in the kinetic modeling, as were the corresponding reverse reactions. A total of 44 reactions were, therefore, modeled simultaneously.
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