Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/ijms232113178
Keywords
four-component relativistic NMR calculations; transition metal complexes; nitrogen-coordinated complexes of cobalt
Funding
- Russian Science Foundation [21-73-00182]
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Both four-component relativistic and nonrelativistic computations within the GIAO-DFT(PBE0) formalism have been carried out for N-15 and Co-59 NMR shielding constants and chemical shifts of a number of the nitrogen-coordinated complexes of cobalt. The study found that the relativistic and solvent effects on the chemical shifts of nitrogen-coordinated cobalt complexes are significant.
Both four-component relativistic and nonrelativistic computations within the GIAO-DFT(PBE0) formalism have been carried out for N-15 and Co-59 NMR shielding constants and chemical shifts of a number of the nitrogen-coordinated complexes of cobalt. It was found that the total values of the calculated nitrogen chemical shifts of considered cobalt complexes span over a range of more than 580 ppm, varying from -452 to +136 ppm. At that, the relativistic corrections to nitrogen shielding constants and chemical shifts were demonstrated to be substantial, changing accordingly from ca. -19 to +74 ppm and from -68 to +25 ppm. Solvent effects on N-15 shielding constants and chemical shifts were shown to have contributions no less important than the relativistic effects, namely from -35 to +63 ppm and from -74 to +23 ppm, respectively. Cobalt shielding constants and chemical shifts were found to vary in the ranges of, accordingly, -20,157 to -11,373 ppm and from +3781 to +13,811. The relativistic effects are of major importance in the cobalt shielding constants, resulting in about 4% for the shielding-type contributions, while solvent corrections to cobalt shielding constants appeared to be of less significance, providing corrections of about 1.4% to the gas phase values.
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