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Issue 3, 2011
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Complete and incomplete spin transitions in 1D chain iron(ii) compounds

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The synthesis and characterisation of two new octahedral iron(II) SCO coordination polymers [FeL1(bimm)] (1) and [FeL2(bppa)](MeOH)0.5 (2) (L1 = [3,3′]-[1,2-phenylenebis(iminomethylidyne)bis(4-phenyl-2,4-butanedionato)(2-)-N,N′,O2,O2′], L2 = [E,E]-[{diethyl 2,2′-1,2-phenylenebis(iminomethylidyne)bis(3-oxo-3-phenylpropanato)}(2-)-N,N′,O3,O3′], bimm = bis(1H-imidazol-1-yl)methane and bppa = 1,3-bis(pyridine-4-yl)propane) is presented. Results from X-ray structure analysis at different temperatures revealed in the case of 1 that the transition from a gradual to a cooperative SCO with a 5 K wide hysteresis is due to an increase of the short intermolecular contacts, which exceed a certain threshold for the cooperative effect. In the case of compound 2 an incomplete spin transition with a 4 K wide hysteresis was observed. The low temperature χMT product remains constant at a value typical for a mixed HS/LS state in stepwise spin transitions. A quantitative correlation between the cooperative effects of 12 monomer and polymer iron(II) SCO complexes and their structural properties derived from X-ray structure analysis, the so-called crystal contact index, CCI, is introduced.

Graphical abstract: Complete and incomplete spin transitions in 1D chain iron(ii) compounds

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The article was received on 01 Oct 2010, accepted on 25 Nov 2010 and first published on 24 Dec 2010

Article type: Paper
DOI: 10.1039/C0NJ00750A
New J. Chem., 2011,35, 691-700

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    Complete and incomplete spin transitions in 1D chain iron(II) compounds

    T. M. Pfaffeneder, S. Thallmair, W. Bauer and B. Weber, New J. Chem., 2011, 35, 691
    DOI: 10.1039/C0NJ00750A

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