Volume 28, Issue 16 pp. 2559-2568

Merging multiconfigurational wavefunctions and correlation functionals to predict magnetic coupling constants

Ángel J. Pérez-Jiménez

Corresponding Author

Ángel J. Pérez-Jiménez

Departamento de Química-Física, Universidad de Alicante, E-03080 Alicante, Spain

Departamento de Química-Física, Universidad de Alicante, E-03080 Alicante, SpainSearch for more papers by this author
José M. Pérez-Jordá

José M. Pérez-Jordá

Departamento de Química-Física, Universidad de Alicante, E-03080 Alicante, Spain

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Ibério de P. R. Moreira

Ibério de P. R. Moreira

Departament de Química Física, i Centre especial de Recerca en Química Teòrica, Universitat de Barcelona i Parc Científic de Barcelona, C/Martí i Franquès 1, E-08028 Barcelona, Spain

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Francesc Illas

Francesc Illas

Departament de Química Física, i Centre especial de Recerca en Química Teòrica, Universitat de Barcelona i Parc Científic de Barcelona, C/Martí i Franquès 1, E-08028 Barcelona, Spain

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First published: 07 May 2007
Citations: 10

Abstract

We study the performance of different approaches that combine multiconfigurational wavefunctions with correlation functionals for the calculation of magnetic coupling constants of several materials and molecules. The systems under study include four antiferromagnetic materials: NiO, KNiF3, K2NiF4 and La2CuO4; two biradicals: α-4-Dehydrotoluene and 1,1′,5,5′-Tetramethyl-6,6′-dioxo-3,3′-biverdazyl; two molecular complexes: [Cu2Cl6]−2 and Copper(II) acetate monohidrate; and the prototypical H-He-H system. On average, the best results are obtained with a recently proposed method [Phys. Rev. A 75, 012503 (2007)] that estimates the correlation energy of density functionals from a pair of alternative spin densities built from the natural orbitals and occupation numbers of the multiconfigurational wavefunction. © 2007 Wiley Periodicals, Inc. J Comput Chem, 2007

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