Multiconfiguration Pair-Density Functional Theory Predicts Spin State Ordering in Iron Complexes with the Same Accuracy as Complete Active Space Second-Order Perturbation Theory at a Significantly Reduced Computational Cost

作者：Wilbraham Liam; Verma Pragya; Truhlar Donald G^*; Gagliardi Laura^*; Ciofini Ilaria^*

来源：Journal of Physical Chemistry Letters, 2017, 8(9): 2026-2030.

DOI：10.1021/acs.jpclett.7b00570

The spin-state orderings in nine Fe(II) and Fe(III) complexes with ligands of diverse ligand-field strength were investigated with multiconfiguration pair-density functional theory (MC-PDFT). The performance of this method was compared to that of complete active space second-order perturbation theory (CASPT2) and Kohn-Sham density functional theory. We also investigated the dependence of CASPT2 and MC-PDFT results on the size of the active-space. MC-PDFT reproduces the CASPT2 spin-state ordering, the dependence on the ligand field strength, and the dependence on active space at a computational cost that is significantly reduced as compared to CASPT2.

• 出版日期2017-5-4