Thermodynamics and kinetics of Spin State Switching in Prussian Blue Analogue KxCoFe(CN)6 from single crystal diffraction by synchrotron rad

Prussian Blue Analogues are of interest for both fundamental research and practical application; porosity, photo-magnetism, charge transfer phenomena, ionic conductivity, spin state transitions may serve as examples. At variance with other molecular magnets and spin-crossover molecular crystals, for PBAs there are very few cases when the magneto-structural phenomena can be characterized with accuracy and precision of single crystal structural analysis; most of the structural information available so far for PBAs are obtained with powder diffraction methods. We have grown single crystal of KxCoFe(CN)6 that show temperature-induced charge transfer – spin state transition. We propose here to do full structural study of temperature and light induced switching of the Fe(II)/Co(III) – Fe(III)/Co(II) spin states, aiming at the end to provide, for a first time from single crystal data, estimates of the enthalpy, entropy, and associated kinetic parameters of the spin conversion.