Comprehensive Theoretical View of the [Cu2O2] Side-on-Peroxo-/Bis-μ-Oxo Equilibria

0557863 - ÚOCHB 2023 RIV DE eng J - Journal Article
Stanczak, Agnieszka - Chalupský, Jakub - Rulíšek, Lubomír - Straka, Michal
Comprehensive Theoretical View of the [Cu2O2] Side-on-Peroxo-/Bis-μ-Oxo Equilibria.
ChemPhysChem. Roč. 23, č. 14 (2022), č. článku e202200076. ISSN 1439-4235. E-ISSN 1439-7641
R&D Projects: GA MŠMT(CZ) LTAUSA19148; GA MŠMT(CZ) EF16_019/0000729; GA ČR(CZ) GJ20-06451Y
Institutional support: RVO:61388963
Keywords : dicopper-oxygen complexes * density functional calculations * coupled cluster * multireference calculations * solvent effects
OECD category: Physical chemistry
Impact factor: 2.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1002/cphc.202200076

Coupled binuclear copper (CBC) sites are employed by many metalloenzymes to catalyze a broad set of biochemical transformations. Typically, the CBC catalytic sites are activated by the O-2 molecule to form various [Cu2O2] reactive species. This has also inspired synthesis and development of various biomimetic inorganic complexes featuring the CBC core. From theoretical perspective, the [Cu2O2] reactivity often hinges on the side-on-peroxo-dicopper(II) (P) vs. bis-mu-oxo-dicopper(III) (O) isomerism an equilibrium that has become almost iconic in theoretical bioinorganic chemistry. Herein, we present a comprehensive calibration and evaluation of the performance of various composite computational protocols available in contemporary computational chemistry, involving coupled-cluster and multireference (relativistic) wave function methods, popular density functionals and solvation models. Starting with the well-studied reference [Cu2O2(NH3)(6)](2+) system, we compared the performance of electronic structure methods and discussed the relativistic effects. This allowed us to select several 'calibrated' DFT functionals that can be conveniently employed to study ten experimentally well-characterized [Cu2O2] inorganic systems. We mostly predicted the lowest-energy structures (P vs. O) of the studied systems correctly. In addition, we present calibration of the used electronic structure methods for prediction of the spectroscopic features of the [Cu2O2] core, mostly provided by the resonance Raman (rR) spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0331711