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Quick scheme for evaluation of atomic charges in arbitrary aluminophosphate sieves on the basis of electron densities calculated with DFT methods
Author(s) -
Larin A. V.,
Mortier W. J.,
Vercauteren D. P.
Publication year - 2007
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.20660
Subject(s) - basis (linear algebra) , basis set , charge (physics) , chemistry , simple (philosophy) , electron , set (abstract data type) , atomic physics , atomic charge , computational chemistry , mathematics , physics , density functional theory , quantum mechanics , geometry , molecule , computer science , philosophy , organic chemistry , epistemology , programming language
Abstract It is demonstrated that unique and simple analytical functions are justified for the atomic charge dependences q of the T (T = Al, P) and O atoms of aluminophosphates (AlPOs) using DFT calculations with several basis sets, starting from STO‐3G to 3‐21G and 6‐21G**. Three internal (bonds, angles, …) coordinates for the charge dependences of the T atoms and four coordinates for the O are sufficient to reach a precision of 1.8% for the fitted q (Al), 1.0% for q (P), and 2.5% for q (O) relatively to the values calculated at any basis set level. The proposed strategy consists in an iterative scheme starting from charge dependences based on the neighbor's positions only. Electrostatic potential values are computed to illustrate the differences between the calculated and fitted charges in the considered AlPO models. © 2007 Wiley Periodicals, Inc. J Comput Chem, 2007