Journal of the Chemical Society, Dalton Transactions p. 1275 - 1281 (1996)
Update date:2022-08-03
Topics:
Young, Nigel A.
Iron and bromine K-edge X-ray absorption fine structure (XAFS) have been used to determine the changes in the local iron environment in [Fe(dppen)2Br2]·2Me2CO on going through the spin cross-over transition at 160-185 K. The mean Fe-P bond length decreases from the high- to the low-spin isomer by 0.29 A [2.60(3) to 2.31(3) A], whereas the mean Fe-Br bond length decreases by only ca. 0.02 A [2.51(3) to 2.48(3), iron K-edge; 2.48(3) to 2.47(3) A, bromine K-edge]. Iron K-edge XAFS for [Fe(dppen)2Cl2]·2Me2CO showed a reduction of 0.28 A in the mean Fe-P distance [2.55(3) to 2.27(3) A] and a reduction of 0.02 A in the mean Fe-Cl bond length [2.33(3) to 2.31 (3) A] on going from the high- to the low-spin form, in good agreement with literature values, the spin transition being observed at 220-240 K.
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