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Article Dans Une Revue Angewandte Chemie International Edition Année : 2016

First step towards a Devil's Staircase in Spin Crossover materials First step towards Devil's Staircase in Spin Crossover materials

Résumé

The unprecedented bimetallic 2D coordination polymer {Fe[(Hg(SCN)3 )2 ](4,4'-bipy)2 }n exhibits a thermal high-spin (HS)↔low-spin (LS) staircase-like conversion characterized by a multi-step dependence of the HS molar fraction γHS . Between the fully HS (γHS =1) and LS (γHS =0) phases, two steps associated with different ordering appear in terms of spin-state concentration waves (SSCW). On the γHS ≈0.5 step, a periodic SSCW forms with a HS-LS-HS-LS sequence. On the γHS ≈0.34 step, the 4D superspace crystallography structural refinement reveals an aperiodic SSCW, with a HS-LS sequence incommensurate with the molecular lattice. The formation of these different long-range spatially ordered structures of LS and HS states during the multi-step spin-crossover is discussed within the framework of "Devil's staircase"-type transitions. Spatially modulated phases are known in various types of materials but are uniquely related to molecular HS/LS bistability in this case.
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Dates et versions

hal-01322372 , version 1 (27-05-2016)

Identifiants

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Elzbieta Trzop, Daopeng Zhang, Lucia Piñeiro-Lopez, Francisco J. Valverde-Muñoz, M Carmen Muñoz, et al.. First step towards a Devil's Staircase in Spin Crossover materials First step towards Devil's Staircase in Spin Crossover materials. Angewandte Chemie International Edition, 2016, 55 (30), pp.8675-8679. ⟨10.1002/anie.201602441⟩. ⟨hal-01322372⟩
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