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Issue 10, 2009
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Spin crossover complexes as building units of hydrogen-bonded nanoporous structures

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Abstract

The paper reports on the synthesis, crystal structure, differential scanning calorimetry (DSC) and magnetic properties of a spin crossover salt of formula [Fe(bpp)2](cis,cis-1,3,5-Hchtc)·5.5 H2O (1) (bpp = 2,6-bis(pyrazol-3yl)pyridine; cis,cis-1,3,5-Hchtc = monoprotonated cyclohexanetricarboxylate dianion). The salt shows a porous structure with water molecules sitting in the channels. The electronic configuration of the Fe2+ ions is high-spin (HS). Desolvation of 1 yields a material exhibiting an abrupt spin crossover with a thermal hysteresis loop located near room temperature (T1/2↑ = 319 K and T1/2↓ = 309 K). Rehydration of this desolvated salt yields an essentially low-spin (LS) material. This is the first example of a series of hydrogen-bonded porous structures that combine a Fe(bpp)2 spin crossover unit acting as a hydrogen-bond donor and polycarboxylate anions acting as hydrogen-bond acceptors with different connectivities.

Graphical abstract: Spin crossover complexes as building units of hydrogen-bonded nanoporous structures

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Publication details

The article was received on 08 Jun 2009, accepted on 21 Aug 2009 and first published on 02 Sep 2009


Article type: Paper
DOI: 10.1039/B911137A
Citation: CrystEngComm, 2009,11, 2198-2203
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    Spin crossover complexes as building units of hydrogen-bonded nanoporous structures

    E. Coronado, M. C. Giménez-López, C. Giménez-Saiz and F. M. Romero, CrystEngComm, 2009, 11, 2198
    DOI: 10.1039/B911137A

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