Generation and ESR investigation of YF2 and Y(CN)2 radicals in rare gas matrices
Knight, L. B.; Wise, M. B. Generation and ESR investigation of YF2 and Y(CN)2 radicals in rare gas matrices. J. Chem. Phys. 1980, 73, 4946-4946.
The YF2 and Y(CN)2 radicals have been generated and trapped in argon and krypton matrices at 12 K and studied via ESRspectroscopy. Codeposition reactions between Y and X2 were found to produce Y(CN)2 but not YF2 which was generated by the high temperature vaporization reduction of YF3. Comparisons of matrix codeposition results with gas phase reactions monitored by electronic chemiluminescence are discussed. The magnetic parameters for YF2 in argon are: g 1=1.997(1), g 2=1.989(1), and g 3=1.985(1): 19F; A 1=98(2), A 2=89(2), and A 3=75(2) MHz: 89Y; A 1=758(3), A 2=757(3), and A 3=728(3) MHz. The parameters for Y(CN)2 are: g=1.973(2) and A(89Y)=672(3). The existence of low lying excited states and correlations with the Y++ ion are discussed as reasons why the electronic structure of YF2 differs substantially from that of ScF2. The electronic differences are consistent with recent entropy measurements for these two radicals.
Journal of Chemical Physics