[Fe(bpp)
2][Pt(ox)
2]·H
2O (with bpp = 2,6-bis(pyrazol-3-yl)-pyridine and ox = oxalate) was prepared, and itsspin crossover behavior was characterized. The two-step spin transition behavior changes over several cycles.The original behavior is restored when the sample is allowed to relax for a week. Furthermore, the ST exhibitsa strong dependence on the heating and cooling rate. Heating the compound at 1 K/min leads to a spintransition with a third step and a second plateau at
HS ![](/images/entities/ap.gif)
0.8. Quenching the sample to 77 K also affects thespin transition behavior. The kinetic relaxation is followed after quenching and after light-induced excitedspin state trapping experiments.