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Comparative calculation of EPR spectral parameters in [Mo(V)OX4]-, [Mo(V)OX5]2-, and [Mo(V)OX4(H2O)]- complexes.


ABSTRACT: The EPR spectral parameters, i.e. g-tensors and molybdenum hyperfine couplings, for several d(1) systems of the general formula [Mo(V)EX(4)](n-), [Mo(V)OX(5)](2-), and [Mo(V)OX(4)(H(2)O)](-) (E = O, N; X = F, Cl, Br; n = 1 or 2) were calculated using Density Functional Theory. The influence of basis sets, their contraction scheme, the type of exchange-correlation functional, the amount of Hartree-Fock exchange, molecular geometry, and relativistic effects on the calculated EPR spectra parameters have been discussed. The g-tensors and molybdenum hyperfine coupling parameters were calculated using a relativistic Hamiltonian coupled with several LDA, GGA, and 'hybrid' exchange-correlation functionals and uncontracted full-electron DGauss DZVP basis sets. The calculated EPR parameters are found to be sensitive to the Mo=E distance and E=Mo-Cl angle, and thus the choice of starting molecular geometry should be considered as an important factor in predicting the g-tensors and hyperfine coupling constants in oxo-molybdenum compounds. In the present case, the GGA exchange-correlation functionals provide a better agreement between the theory and the experiment.

SUBMITTER: Hadt RG 

PROVIDER: S-EPMC2879133 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature

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Comparative calculation of EPR spectral parameters in [Mo(V)OX4]-, [Mo(V)OX5]2-, and [Mo(V)OX4(H2O)]- complexes.

Hadt Ryan G RG   Nemykin Victor N VN   Olsen Joseph G JG   Basu Partha P  

Physical chemistry chemical physics : PCCP 20090930 44


The EPR spectral parameters, i.e. g-tensors and molybdenum hyperfine couplings, for several d(1) systems of the general formula [Mo(V)EX(4)](n-), [Mo(V)OX(5)](2-), and [Mo(V)OX(4)(H(2)O)](-) (E = O, N; X = F, Cl, Br; n = 1 or 2) were calculated using Density Functional Theory. The influence of basis sets, their contraction scheme, the type of exchange-correlation functional, the amount of Hartree-Fock exchange, molecular geometry, and relativistic effects on the calculated EPR spectra parameters  ...[more]

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