Effect of Pressure on Tetrahedral Ni++ and Co++ Complexes

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Abstract
The effect of pressure has been studied on the spectra of five tetrahedral Co++ complexes and two tetrahedral Ni++ complexes. Calculations have been made for the change in the crystal‐field parameter 10 Dq and for the change in the interelectronic repulsion B. The increase in 10 Dq and the decrease in B correlates strongly with the polarizibility of the ligands. For the Co++ complexes the effect of pressure on the spin‐orbital splitting was studied. The splitting increased with pressure to an extent determined by the mass and polarizability of the ligand. For ZnS compressibility data were available. It was found that the fractional change in Dq for both Co++ and Ni++ was greater than that predicted from the bulk compressibility of ZnS. This is attributed to relaxation in the neighborhood of the foreign ion.

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