Electronic g values of Na+–NO and Cu+–NO complexes in zeolites: Analysis using a relativistic density functional method
Literature Information
Konstantin M. Neyman, Dmitri I. Ganyushin, Vladimir A. Nasluzov, Notker Rösch, Andreas Pöppl, Martin Hartmann
Electronic g values of molecular systems are usually difficult to interpret. We propose a new tool for the analysis of g values in terms of contributions of particular atomic orbitals. This tool benefits from a direct relationship between ground-state relativistic Kohn–Sham orbitals and g values in our novel scheme which takes spin–orbit effects into account self-consistently and employs two-component orbital wave functions obtained after a Douglas–Kroll decoupling of the four-component Dirac–Kohn–Sham equation to calculate electronic g values. We rationalize the notable difference in the g tensor anisotropy of adsorption complexes of an NO probe with charge compensating Na+ and Cu+ cations in zeolites. g components of the Na+–NO species, all three of them measured and calculated smaller than the free-electron value ge, reflect the essentially electrostatic adsorption mechanism. At variance, two g components larger than ge are obtained for the complex Cu+–NO and they are shown to manifest covalent interactions due to Cu 3d orbitals.
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