Issue 20, 2014

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

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

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2014
Accepted
30 Mar 2014
First published
31 Mar 2014

Dalton Trans., 2014,43, 7577-7588

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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