Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió acceptadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/154484
On the zeroth-order Hamiltonian for CASPT2 calculations of spin crossover compounds
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
Complete active space self-consistent field theory (CASSCF) calculations and subsequent second-order perturbation theory treatment (CASPT2) are discussed in the evaluation of the spin-states energy difference (ΔHelec) of a series of seven spin crossover (SCO) compounds. The reference values have been extracted from a combination of experimental measurements and DFT + U calculations, as discussed in a recent article (Vela et al., Phys Chem Chem Phys 2015, 17, 16306). It is definitely proven that the critical IPEA parameter used in CASPT2 calculations of ΔHelec, a key parameter in the design of SCO compounds, should be modified with respect to its default value of 0.25 a.u. and increased up to 0.50 a.u. The satisfactory agreement observed previously in the literature might result from an error cancellation originated in the default IPEA, which overestimates the stability of the HS state, and the erroneous atomic orbital basis set contraction of carbon atoms, which stabilizes the LS states.
Citació
Citació
VELA LLAUSÍ, Sergi, FUMANAL QUINTANA, María, RIBAS ARIÑO, Jordi, ROBERT, V.. On the zeroth-order Hamiltonian for CASPT2 calculations of spin crossover compounds. _Journal of Computational Chemistry_. 2016. Vol. 37, núm. 10, pàgs. 947-953. [consulta: 24 de gener de 2026]. ISSN: 0192-8651. [Disponible a: https://hdl.handle.net/2445/154484]