Spectrochemical Study of Microscopic Crystals. XX1. The Dichroism of Tris(ethylenediamine)-cobalt(III) and -chromium(III)2

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Abstract
The dichroism in the visible and ultraviolet region has been quantitatively determined at room temperature by Tsuchida and Kobayashi’s microscopic method with a single crystal of d, l-[Co en3] Cl3·3H2O, d, l- [Co en3] Br3·3H2O, d- [Co en3] Br3·2H2O and d, l-[Cr en3] Cl3·3H2O. It has been found that the [Co en3]3+ and the [Cr en3]3+ ion show a similar type of dichroism. For both the complex ions, the z-absorption is slightly stronger than the x-absorption in the wavelength region of the first absorption band and much weaker than the x-absorption in the region of the second absorption band. The results of the measurements are discussed in relation to the electronic state and the optical rotatory dispersion of the complex ions.