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The thermal spin transition between a high-spin state ( S = 5/2) and an intermediate-spin state ( S = 3/2) of the octhahedrally coordinated Mn(II)(3d 5 ) was observed in Rb(I)Mn(II)Fe(III)(CN) 6 with a very wide hysteresis loop over the temperature range of 231 to 304 K. This phenomenon is accompanied by a structural distortion from the face-centered cubic structure to the tetragonal one caused by a cooperative Jahn−Teller effect in the octahedral Fe(III)C 6 moiety. To our knowledge, the present spin transition is the first observation in compounds containing a six-coordinated Mn(II).
Ohkoshi et al. (Sat,) studied this question.
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