An empirical rule for the type of luminescence (fluorescence only, fluorescence and phosphorescence, phosphorescence only) to be expected, which depends on the position of the respective ligands in the spectrochemical series, has been found for octahedral chromium (III) complexes. This correlation is discussed in terms of the shape and intersection of potential-energy surfaces.

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Luminescence measurements with crystalline [Cr urea6][Cr(CN)6]·3H2O using light of 580 mμ and 435 mμ for excitation clearly indicate an excitation energy transfer from chromium(III) in the cation to chromium(III) in the anion.

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