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Issue 1, 2017
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Four-step iron(II) spin state cascade driven by antagonistic solid state interactions

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Abstract

A four-stepped cascade of Fe(II) high spin (HS) to low spin (LS) states is demonstrated in a family of 2-D Hofmann materials, [Fe3II(saltrz)6(MII(CN)4)3]·8(H2O) (MII = Pd (1Pd), Pt (1Pt); saltrz = (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)phenol). Alongside the fully HS and LS Fe(II) states, fractional spin state stabilization occurs at HS/LS values of 5/6, 2/3, and 1/6. This unconventional spin state periodicity is driven by the presence of multiple spin crossover (SCO) active Fe(II) sites which are in subtly distinct environments driven by a network of antagonistic host–host and host–guest interactions. Alternating long- and short-range magnetostructural ordering is achieved over the five distinct spin state ratios HS1.0LS0.0, HS0.833LS0.167, HS0.667LS0.333, HS0.167LS0.833, and HS0.0LS1.0 owing to the flexibility of this 2-D interdigitated lattice topology interconnected by intermolecular interactions. A distinct wave-like spin state patterning is structurally evidenced for each intermediate phase.

Graphical abstract: Four-step iron(ii) spin state cascade driven by antagonistic solid state interactions

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Publication details

The article was received on 14 Jul 2016, accepted on 11 Sep 2016 and first published on 12 Sep 2016


Article type: Edge Article
DOI: 10.1039/C6SC03114E
Citation: Chem. Sci., 2017,8, 701-707
  • Open access: Creative Commons BY-NC license
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    Four-step iron(II) spin state cascade driven by antagonistic solid state interactions

    N. F. Sciortino, K. A. Zenere, M. E. Corrigan, G. J. Halder, G. Chastanet, J. Létard, C. J. Kepert and S. M. Neville, Chem. Sci., 2017, 8, 701
    DOI: 10.1039/C6SC03114E

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