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Acta Cryst. (2014). A70, C772
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The 2D layer compound [Fe(pyrazine)Pt(CN)4] has received a lot of attention because of its spin transition with a large hysteresis at room temperature, the possibility of bidirectional light-switching, and its potential as sensor for various gases [1], and in a recent study it served as test case for time-resolved electron diffraction on the nano-second time scale [2]. The present study focuses on the photo-induced HS → LS relaxation of the hydrated compound monitored by synchrotron XRPD measurements at 10 K (Figure 1). For the title compound, the time evolution of the XRD pattern shows a complex relaxation behaviour, which can be modelled with an initial random relaxation followed by a nucleation and growth process.

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