Charge density and spectra of dichlorotetrakis(thiourea) nickel(II): an ab initio discrete variation X? calculation
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 10,p. 2947-2951
- https://doi.org/10.1039/dt9900002947
Abstract
An ab initio calculation using the discrete variational Xα implementation of Hartree–Fock–Slater theory, with frozen cores, has been performed on the compound [Ni(tu)4Cl2](tu = thiourea) in the experimental geometry, and the results compared with the optical spectra, the magnetic susceptibilities, and the charge-density distribution. The treatment provides a better account of the experimental observations than earlier analyses using empirical ligand-field models. It suggests a reassignment of some features of the spectra, and supports the quite appreciable covalence, involving both σ- and π-charge flows, that is observed in the charge-density study. The reduction in the electron-repulsion parameters inferred in our interpretation of the spectra is consistent with this large covalence.Keywords
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