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The spectra of chromium acetylacetonate and several derivatives have been recorded at 77° and 4°K. The structure in the 12 000–15 000 cm—1 region has been assigned to vibronic components of 2E←4A2 and the 2T1 state located. The effect of ligand halogenation on the trigonal field splitting is small.
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Armendarez et al. (1964) studied this question.
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