Abstract
Abstract The optical absorption spectrum of single crystals of CrCl2 . 4H2O has been studied at room temperature and at 77°k. The broad band at 14 300 cm-1 in the solution spectrum is resolved into three bands at 13 100 cm-1, 15 200 cm-1 and 18 800 cm-1 in the crystal spectrum at 77°k. Two of these bands are strongly polarized. Many weak absorption lines have also been detected in the region 16 000—24 000 cm-1 and the observed temperature and polarization effects are recorded. The spectrum is compared with the energy levels predicted by ligand field theory and the presence of a large Jahn—Teller distortion in this salt is confirmed. The spectrum of CrSO4. 7H2O has been found to be very similar to the chloride spectrum.
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