An ab initio study of the electrostatics of protonated amines: application to the molecular mechanics (MM3) force field

被引：7
|
作者：
Sorensen, JB
Lewin, AH
Bowen, JP [1 ]
机构：
[1] Univ Georgia, Dept Chem, Compuat Ctr Mol Struct & Design, Athens, GA 30602 USA
[2] Res Triangle Inst, Res Triangle Pk, NC 27709 USA
来源：
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM | 2003年 / 623卷
关键词：
MM3; ab initio; ChelpG; ammonium ions; dipole;
D O I：
10.1016/S0166-1280(02)00691-7
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 geometries and charge distributions of 20 small ammonium ions have been calculated at the MP2/6-311G** level of theory. ChelpG charges were used to determine the molecular polarities and fundamental bond moments of protonated aliphatic amines. The molecular mechanics (MM3) force field has been updated to reflect the correct polarity of the C-N+ and N+-H bonds, and to more closely reproduce ab initio-derived skeletal bond lengths of ammonium ions. These improvements lead to a force field which accurately reproduces geometric and energetic features of a variety of ammonium ions. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：145 / 158
页数：14
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