INFRARED SPECTRA OF HEXAFLUORIDES OF THE SECOND TRANSITION GROUP $ELEMENTS^{*}$

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1961

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Ohio State University

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The vibrational spectra of the hexafluorides of the third transition group elements, which contain from zero to four non-bonding 5d electrons, have been studied in recent years and found unusually interesting because of a dynamical Jahn-Teller effect that results in a broadening of certain infrared and Raman $bands.^{1,2,3}$ Several corresponding (4d) hexafluorides of the second transition group elements have recently been prepared in this laboratory. Infrared spectra of these molecules will be reported. Both infrared-active fundamentals have been observed for each of the molecules and most of the other fundamentals have been determined from combination bands. The broadening of certain combination bands that has been ascribed to a Jahn-Teller coupling in the 5d hexafluorides is even more pronounced in the corresponding 4d hexafluorides.

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$^{*}$Based on work performed under the auspices of the U.S Atomic Energy Commission. $^{1}$H. H. Classen and B. Weinstock, J. Chem. Phys, 33, 436 (1960). $^{2}$B. Weinstock, H. H. Claassen and J. G Malm, J. Chem. Phys. 32, 181 (1960). $^{3}$M. S. Child, Mol. Phys. 3, 605 (1960).
Author Institution: Chemistry Division, Argonne National Laboratory

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