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Ab initio calculations on halogen‐bonded complexes and comparison with density functional methods
Author(s) -
Lu YunXiang,
Zou JianWei,
Fan JiCai,
Zhao WenNa,
Jiang YongJun,
Yu QingSen
Publication year - 2008
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.21094
Subject(s) - extrapolation , basis set , coupled cluster , ab initio , electronic correlation , perturbation theory (quantum mechanics) , chemistry , density functional theory , computational chemistry , ab initio quantum chemistry methods , series (stratigraphy) , binding energy , møller–plesset perturbation theory , halogen , molecule , atomic physics , thermodynamics , quantum mechanics , physics , mathematics , mathematical analysis , paleontology , alkyl , organic chemistry , biology
A systematic theoretical investigation on a series of dimeric complexes formed between some halocarbon molecules and electron donors has been carried out by employing both ab initio and density functional methods. Full geometry optimizations are performed at the Moller–Plesset second‐order perturbation (MP2) level of theory with the Dunning's correlation‐consistent basis set, aug‐cc‐pVDZ. Binding energies are extrapolated to the complete basis set (CBS) limit by means of two most commonly used extrapolation methods and the aug‐cc‐pVXZ ( X = D, T, Q) basis sets series. The coupled cluster with single, double, and noniterative triple excitations [CCSD(T)] correction term, determined as a difference between CCSD(T) and MP2 binding energies, is estimated with the aug‐cc‐pVDZ basis set. In general, the inclusion of higher‐order electron correlation effects leads to a repulsive correction with respect to those predicted at the MP2 level. The calculations described herein have shown that the CCSD(T) CBS limits yield binding energies with a range of −0.89 to −4.38 kcal/mol for the halogen‐bonded complexes under study. The performance of several density functional theory (DFT) methods has been evaluated comparing the results with those obtained from MP2 and CCSD(T). It is shown that PBEKCIS, B97‐1, and MPWLYP functionals provide accuracies close to the computationally very expensive ab initio methods. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2009