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Density functional approximations for consistent spin and oxidation states of oxoiron complexes
Author(s) -
Vlahovic Filip,
Gruden Maja,
Stepanovic Stepan,
Swart Marcel
Publication year - 2020
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.26121
Subject(s) - density functional theory , spin density , spin states , solvation , implicit solvation , robustness (evolution) , spin (aerodynamics) , computational chemistry , statistical physics , series (stratigraphy) , state (computer science) , chemistry , physics , quantum mechanics , mathematics , thermodynamics , atomic physics , condensed matter physics , algorithm , molecule , paleontology , biochemistry , biology , gene
Abstract We report here a computational study on a series of Fe II , Fe III , and Fe IV hydroxo/oxoiron complexes with a broad palette of ligands. We are interested in assessing the robustness of widely used density functionals for their prediction and description of structures and spin states for the examined oxoiron complexes. We have used a variety of density functional approximations (S12g, LDA, BP86‐D 3 , OPBE, SSB‐D, B3LYP‐D 3 , S12h, and MVS), in all cases including solvation and relativistic effects explicitly. One of the main observations of this detailed study is the excellent performance of S12g for both accurate structures and spin state splittings. Moreover, our results show that in general all density functionals can be used as a reliable computational tool for reproducing and predicting geometries, determining the oxidation state of iron, and most are able as well to providing good descriptions of spin state energetics.