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Issue 19, 2020
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Accurate computed spin-state energetics for Co(iii) complexes: implications for modelling homogeneous catalysis

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Abstract

Co(III) complexes are increasingly prevalent in homogeneous catalysis. Catalytic cycles involve multiple intermediates, many of which will feature unsaturated metal centres. This raises the possibility of multi-state character along reaction pathways and so requires an accurate approach to calculating spin-state energetics. Here we report an assessment of the performance of DLPNO-CCSD(T) (domain-based local pair natural orbital approximation to coupled cluster theory) against experimental 1Co to 3Co spin splitting energies for a series of pseudo-octahedral Co(III) complexes. The alternative NEVPT2 (strongly-contracted n-electron valence perturbation theory) and a range of density functionals are also assessed. DLPNO-CCSD(T) is identified as a highly promising method, with mean absolute deviations (MADs) as small as 1.3 kcal mol−1 when Kohn–Sham reference orbitals are used. DLPNO-CCSD(T) out-performs NEVPT2 for which a MAD of 3.5 kcal mol−1 can be achieved when a (10,12) active space is employed. Of the nine DFT methods investigated TPSS is the leading functional, with a MAD of 1.9 kcal mol−1. Our results show how DLPNO-CCSD(T) can provide accurate spin state energetics for Co(III) species in particular and first row transition metal systems in general. DLPNO-CCSD(T) is therefore a promising method for applications in the burgeoning field of homogeneous catalysis based on Co(III) species.

Graphical abstract: Accurate computed spin-state energetics for Co(iii) complexes: implications for modelling homogeneous catalysis

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Supplementary files

Article information


Submitted
16 Mar 2020
Accepted
20 Apr 2020
First published
21 Apr 2020

This article is Open Access

Dalton Trans., 2020,49, 6478-6487
Article type
Paper

Accurate computed spin-state energetics for Co(III) complexes: implications for modelling homogeneous catalysis

S. E. Neale, D. A. Pantazis and S. A. Macgregor, Dalton Trans., 2020, 49, 6478
DOI: 10.1039/D0DT00993H

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