Ab initio study of nitromethane deprotonation by (OH)-•nH2O clusters

被引:20
作者
Beksic, D
Bertrán, J [1 ]
Lluch, JM
Hynes, JT
机构
[1] Univ Autonoma Barcelona, Dept Quim, Bellaterra 08193, Barcelona, Spain
[2] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA
关键词
D O I
10.1021/jp973426h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The deprotonation of nitromethane by (OH)(-). nH(2)O clusters has been studied. Ab initio quantum chemistry calculations including electron correlation are used to determine the geometries, energetics, and natural bond orbital electronic populations of reactants, transition states, and products for the cases of n = 0 and n = 2. An analysis of the negative charge redistribution during the reactions is given. In particular, special attention is devoted to the evolution of the negative charge on carbon, which has been implicated in the past in the observed anomalous values of the Bronsted parameter in the reaction of interest, the so-called "nitroalkane anomaly". Finally, the deprotonation of nitromethane by (OH)(-) is compared with the analogous reaction involving acetonitrile; the results suggest that the high electron affinity of the NO2 group is critical for the existence of the nitroalkane anomaly.
引用
收藏
页码:3977 / 3984
页数:8
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