LAMB-MOSSBAUER FACTOR IN THE SPIN-CROSSOVER COMPOUND FE(TPA)(NCS)(2)

The Lamb-Mossbauer factor in spin crossover compounds has been the sub ject of controversial discussions in the literature. For several compo unds, a significantly larger Lamb-Mossbauer factor for the complex mol ecules in the low-spin (f(LS)) than in the high-spin (f(HS)) State has been reported, while for compounds studied in our laboratory such dif ferences could not be observed. We prepared the compound Fe(tpa)(NCS)( 2), the f factors of which were reported to be very different. We coul d not prove the f factors of this compound to be different. The implic ations of a different structural phase of compound prepared by us are discussed.