Magnetic Evidence for d3s Bond Hybridization in Chromium (II) Acetate. The Oxidation State of Chromium in a Reported Tris(8-Hydroxyquinoline) Chromium (II)

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Abstract
Magnetic susceptibilities of solid Cr(OOCCH3)2 and its monohydrate were measured, and these compounds were shown to contain no unpaired electrons. This fact indicates that the four unpaired 3d electrons of the normal Cr++ ion are paired in these compounds, the three 3d orbitals thus made available being utilized in the formation of covalent bonds. The fourth covalent bond probably involves use of the 4s orbital of chromium. This evidence may constitute the first example of d3s bond hybridization postulated by Pauling. Susceptibility measurements were also carried out on tris(8-hydroxyquinoline) chromium (III) and a reported tris(8-hydroxyquinoline) chromium (II). The evidence indicates both to be the same compound, with the chromium having a tripositive oxidation state.