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Issue 20, 2014
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Iron(II) complexes of 2,6-di(1H-pyrazol-3-yl)-pyridine derivatives with hydrogen bonding and sterically bulky substituents

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Abstract

Syntheses of 2,6-di(5-aminopyrazol-3-yl)pyridine (L1), 2,6-di(5-tertbutylcarboxamidopyrazol-3-yl)pyridine (L2), 2,6-di(5-tertbutylpyrazol-3-yl)pyridine (L3), 2-(5-tertbutylpyrazol-3-yl)-6-(5-methylpyrazol-3-yl)pyridine (L4) and 2-(5-tertbutylpyrazol-3-yl)-6-(5-aminopyrazol-3-yl)pyridine (L5) are reported. Iron complex salts of the first four ligands were crystallographically characterised. The structures exhibit intermolecular hydrogen bonding between the cations and the anions and/or solvent, leading to a fluorite (flu) net, a 1D ladder structure, and a homochiral self-penetrating helical network related to the (10,3)-a (srs) topology. All the complexes are high-spin in the crystal, and bulk samples are also fully or predominantly high-spin at room temperature and below although two of the dried materials exhibit partial spin-state transitions on cooling.

Graphical abstract: Iron(ii) complexes of 2,6-di(1H-pyrazol-3-yl)-pyridine derivatives with hydrogen bonding and sterically bulky substituents

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Publication details

The article was received on 03 Feb 2014, accepted on 30 Mar 2014 and first published on 31 Mar 2014


Article type: Paper
DOI: 10.1039/C4DT00355A
Citation: Dalton Trans., 2014,43, 7577-7588
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    Iron(II) complexes of 2,6-di(1H-pyrazol-3-yl)-pyridine derivatives with hydrogen bonding and sterically bulky substituents

    T. D. Roberts, M. A. Little, L. J. Kershaw Cook and M. A. Halcrow, Dalton Trans., 2014, 43, 7577
    DOI: 10.1039/C4DT00355A

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