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• W1973256763 endingPage "4629" @default.
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• W1973256763 abstract "A variety of density functional methods have been evaluated in the computation of electronic g-tensors and molybdenum hyperfine couplings for systems ranging from the Mo atom through MoIIIN, [MoVOCl4]-, and [MoVOF5]2- to two larger MoV complexes MoXLCl2 (X = O, S; L = tris(3,5-dimethylpyrazolyl)hydroborate anion). In particular, the influence of the molybdenum basis set and of various exchange−correlation functionals with variable admixtures of Hartree−Fock exchange on the computed EPR parameters have been evaluated in detail. Careful basis-set studies have provided a moderate-sized 12s6p5d all-electron basis on molybdenum that gives hyperfine tensors in excellent agreement with much larger basis sets and that will be useful for calculations on larger systems. The best agreement with experimental data for both hyperfine and g-tensors is obtained with hybrid functionals containing approximately 30−40% Hartree−Fock exchange. Only for MoSLCl2 does increasing spin contamination with increasing exact-exchange admixture restrict the achievable computational accuracy. In all cases, spin−orbit corrections to the hyperfine tensors are sizable and have to be included in accurate calculations. Scalar relativistic effects enhance the isotropic Mo hyperfine coupling by approximately 15−20%. Two-component g-tensor calculations with variational inclusion of spin−orbit coupling show that the Δg∥ components in [MoVOCl4]- and [MoVOF5]2- depend on higher-order spin−orbit contributions and are thus described insufficiently by the usual second-order perturbation approaches. Computed orientations of g- and hyperfine tensors relative to each other and to the molecular framework for the MoXLCl2 complexes provide good agreement between theory and single-crystal electron paramagnetic resonance experiments. In these cases, the hyperfine tensor orientations are influenced only slightly by spin−orbit effects." @default.
• W1973256763 created "2016-06-24" @default.
• W1973256763 creator A5050105330 @default.
• W1973256763 creator A5066792736 @default.
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• W1973256763 date "2007-04-05" @default.
• W1973256763 modified "2023-09-26" @default.
• W1973256763 title "Computational Studies of Electron Paramagnetic Resonance Parameters for Paramagnetic Molybdenum Complexes. 1. Method Validation on Small and Medium-Sized Systems" @default.
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• W1973256763 doi "https://doi.org/10.1021/jp070638y" @default.
• W1973256763 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17408258" @default.
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