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An approach to computing electrostatic charges for molecules
Author(s) -
Singh U. Chandra,
Kollman Peter A.
Publication year - 1984
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.540050204
Subject(s) - thymine , uracil , chemistry , cytosine , guanine , computational chemistry , ab initio , charge (physics) , molecule , nucleobase , physics , quantum mechanics , dna , nucleotide , organic chemistry , gene , biochemistry
Abstract We present an approach for deriving net atomic charges from ab initio quantum mechanical calculations using a least squares fit of the quantum mechanically calculated electrostatic potential to that of the partial charge model. Our computational approach is similar to those presented by Momany [ J. Phys. Chem. , 82 , 592 (1978)], Smit, Derissen, and van Duijneveldt [ Mol. Phys. , 37 , 521 (1979)], and Cox and Williams [ J. Comput. Chem. , 2 , 304 (1981)], but differs in the approach to choosing the positions for evaluating the potential. In this article, we present applications to the molecules H 2 O, CH 3 OH, (CH 3 ) 2 O, H 2 CO, NH 3 , (CH 3 O) 2 PO 2 − , deoxyribose, ribose, adenine, 9‐CH 3 adenine, thymine, 1‐CH 3 thymine, guanine, 9‐CH 3 guanine, cytosine, 1‐CH 3 cytosine, uracil, and 1‐CH 3 uracil. We also address the question of inclusion of “lone pairs,” their location and charge.