Crystallinity and microstructural versatility in the spin-crossover polymeric material [Fe(Htrz)2(trz)](BF4)

The room-temperature microstructure of the spin-crossover (SCO) 1D-polymeric iron(II) compound [Fe(Htrz)2(trz)](BF4) is investigated by mean of powder X-ray diffraction and compared to the SCO features determined by magnetic measurements. The determination of the microstructural parameters such as the sizes of the coherent domains and their morphologies for many samples reveals new features for this material. First, a heating treatment can significantly improve the crystallinity of the material by doubling the coherent domains size. This result may open the route to regenerating this system after the reported mechanical fatigue it undergoes after suffering numerous SCO cycles. In addition, the correlation between the length of the coherent domain and the SCO temperature shows a tendency: the longer the domains - i.e. the longer the iron chains - the higher the SCO temperatures.

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