Stable free radicals can be used as spin probes as well as having potential application as molecular devices and switches. Verdazyls are stable radicals with a large potential for structural diversity, since they carry three potential variable substituents that give a variety of different structures and two nitrogen atoms capable of coordinating metal ions.  The nitrogen atoms contain the bulk of the spin density and this particular property gives strong magnetic interaction between metal and radical, giving us the potential to form extended metal-organic structures with unusual magnetic properties. Bis(1-isopropyl-3,5-3,5-di(2'-pyridyl)-6-oxoverdazyl)iron(II) hexafluorophosphate  was synthesized in three steps from  Pyridine-2-carboxaldehyde-2'-pyridylhydrazone (papyH).  The identity of the verdazyl complex was confirmed by Electron Spin Resonance (ESR), UV-vis, mass spectrometry, IR and X-ray crystallography  Structural data also confirmed the analogy with terpyridine.  We also report initial studies upon the analogous Cobalt(II) ligand complex

Iron and cobalt complexes of a paramagnetic terpyridine analog

243rd National Meeting (2012)

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