Mössbauer spectroscopy of KrF2 and KrF2· MF5 (M=As, Sb)

Mössbauer spectra of KrF2 and the recently synthesized compounds α- and β- [KrF]⁺[AsF6]^- and [KrF]⁺[SbF6]^- have been measured using the 9.4 keV transition of ⁸³Kr produced in the decay of an ⁸³RbF source. The results for the values of quadrupole coupling strengths and the isomer shifts indicate that the Kr-F bonding in all compounds studied is very similar. A slight increase of the quadrupole coupling in going from KrF2 to F-Kr-F-MF5 can be interpreted in terms of a shortening of the average Kr-F bond length. A very accurate value, Q ex/Qgr=1.958±0.002 for the ratio of the quadrupole moments of the 9.4 keV state and the ground state has also been derived from the measurements. Copyright © 1977 American Institute of Physics.