Theoretical rationalization for the equilibrium between (μ-η:η-peroxido)CuCu and bis(μ-oxido)CuCu complexes: Perturbational effects from ligand frameworks
Dalton Transactions, ISSN: 1477-9234, Vol: 49, Issue: 20, Page: 6710-6717
2020
- 3Citations
- 5Captures
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Article Description
DFT calculations are carried out to investigate the geometric effects of the supporting ligands in the relative energies of the (μ-η:η-peroxido)CuCu complex 1 and the bis(μ-oxido)CuCu complex 2. The N-tridentate ligand bearing acyclic propane diamine framework La preferentially provided 1, whereas the N-tridentate ligand with cyclic diamine framework such as 1,4-diazacycloheptane Lb gave 2 after the oxygenation of the corresponding Cu complexes as reported previously [S. Itoh, et al., Inorg. Chem., 2014, 53, 8786-8794]. Calculations at the B3LYP∗-D3 level of theory can reasonably explain the experimental results in relative energies, structures and harmonic frequencies of 1 and 2. Perturbational effects of the diamine chelates of La and Lb especially on the equilibrium of 1 and 2 are investigated in detail. In the range from 2.30 Å to 3.40 Å of the N-N distance in the diamine moiety, 1 is more stable than 2 by 8.4 kcal mol at the distance of 3.40 Å. Calculated potential energies indicate that the decrease in the N-N distance is associated with a decrease in energy of 2, leading that 2 can be most stabilized at the N-N distance of 2.60 Å. Furthermore, molecular orbitals analyses are performed to explain that the energy gaps between the σ∗ orbital of the O-O bond and the d orbitals of the Cu ions of 1 get small as the diamine moiety is shrunk, leading to facilitate the O-O bond cleavage from 1 to 2.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85085536507&origin=inward; http://dx.doi.org/10.1039/d0dt01001d; http://www.ncbi.nlm.nih.gov/pubmed/32368776; https://xlink.rsc.org/?DOI=D0DT01001D; https://dx.doi.org/10.1039/d0dt01001d; https://pubs.rsc.org/en/content/articlelanding/2020/dt/d0dt01001d
Royal Society of Chemistry (RSC)
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