Single Laser Shot Spin State Switching of {Fe^II(pz)[Pt(CN)₄]} Inside Thermal Hysteresis Studied by X-ray Diffraction

First Step Towards a Devil's Staircase in Spin‐Crossover Materials

“…At 90 K, all Fe II sites are also crystallographically equivalent in a similar ( a b c ) cell and Fe−N (1.962(3) Å) is typical of the LS state (Supporting Information, Tables S1 and S4). The Fe−N bond contraction contributes strongly to the lattice deformation in these polymeric SCO materials …”

Reversible Control by Light of the High‐Spin Low‐Spin Elastic Interface inside the Bistable Region of a Robust Spin‐Transition Single Crystal

“…Thes ubstantial benefit of the current method compared to previous investigations using pulse laser excitations [25,26,[30][31][32][33][34] lies in the reversible character of photo-control of the phase transition inside the thermal hysteresis,w hich can be monitored using aweak intensity of light. Note that bidirectional photo-switching inside the thermal hysteresis using pulsed nanosecond laser excitation was first reported for the SC sample [Fe(pyrazine)Pt(CN) 4 ], [35] and later on other type of SC solids, [36] using Raman spectroscopy.W hile there is no doubt about the physical mechanism of the LS to HS photo-transformation, the reverse process inside the hysteresis is still disputable.The reverse process feeds into the healthy debate,w hich was reignited recently by photocalorimetric measurements [37] under pulse laser on the [Fe-(pyrazine)Pt(CN) 4 ]S Cs ample,l eading to ac ontroversy.O f course,t hese results should be confirmed by other investigations,capitalizing as in Ref.…”

Vibrational properties and cooperativity of the 3D spin crossover network [Fe(pyrazine)][Pt(CN)4]

“…For this work two related directions of [Fe(pyrazine)][M(CN)4] studies are important. On the one hand Bousseksou et al 4 and later Collet et al 5 reported that single crystals of [Fe(pyrazine)][Pt(CN)4] can be switched between low-spin (LS) and high-spin (HS) states with a single laser pulse within the hysteresis curve. This behaviour is an example of multiplying the effect of photoexcitation behaviour, i.e.…”