The optical absorption of divalent chromium in CrCl2. 4H2O and CrSO4. 7H2O
- 1 April 1963
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 8 (88) , 605-613
- https://doi.org/10.1080/14786436308211159
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.Keywords
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