Hexaammine Complexes of Cr(III) and Co(III): A Spectral Study.

Procedures are provided for experiments containing complex ions with octahedral symmetry, hexaamminecobalt(III) chloride and hexaamminechromium(III) nitrate, so students can interpret fully the ultra violet/visible spectra of the complex cations in terms of the ligand field parameters, 10 "Dq," the Racah interelectron repulsion parameters, "B," and the relevant Tanabue-Sugano diagrams. (JN)