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Volumn 121, Issue 1, 1999, Pages 227-237

Solvent effects on the barrier to C - N bond rotation in N,N- dimethylaminoacrylonitrile: Modeling by reaction field theory and by Monte Carlo simulations

Author keywords

[No Author keywords available]

Indexed keywords

ACRYLONITRILE;

EID: 84962418529     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9823058     Document Type: Article
Times cited : (30)

References (110)
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    • note
    • It is worthy of note that the data point for acetonitrile in Figure 2 lies somewhat above the best fit line, indicating a higher barrier than in other solvents having comparable values for the Onsager dielectric function. This deviation possibly indicates that acetonitrile, like the aromatic and chlorinated solvents, yields somewhat stronger than expected interactions with polar solutes due to unusually great electronic polarizability. The "soft" π-system of acetonitrile could certainly account for such polarizability. A similar pattern was observed with DMA and DMF previously, where again acetonitrile yielded a somewhat stronger solvent effect than did acetone.
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    • note
    • The default value for this parameter in the Gaussian 94 code is in fact 0.001 electrons per cubic Bohr, not 0.0004. Use of the larger contour would probably also improve the calculated results for DMA.
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    • The one partial exception to this statement is the set of Monte Carlo simulations in TIP4P water, where the experimentally determined solvent effect is underestimated by only about 0.6 kcal/mol.
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    • If electronic polarization terms are explicitly incorporated into the potential functions, then it is of course possible to treat nonpolar solvents correctly, but the cost in computer time is generally very high.
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