Di- and trivalent iron complexes with redox-active 1-(2-pyridylazo)-2-phenanthrol (papl)

Robin A. Taylor, Alan J. Lough, Takele Seda, Prashanth K. Poddutoori, Martin T. Lemaire

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The synthesis and study of redox-active ligand complexes has received much recent attention. We have recently explored the coordination chemistry of arylazo redox-active ligand 1-(2-pyridylazo)-2-phenanthrol (papl) and herein expand the series of complexes to the Group 8 transition metal ion, iron. We report the preparation and structure of a divalent iron complex with the papl anion, Fe(papl)2, which is diamagnetic and features ligand centered redox activity and intense visible electronic transitions. Three polymorphs of the Fe(papl)2complex are reported, including one that exhibits a structural phase transition at low temperature. Oxidation of Fe(papl)2with molecular iodine has produced the low-spin trivalent complex [Fe3+(papl)2]+as an ionic complex with the I3anion. Density functional theory (dft) calculations and data from variable temperature Mössbauer spectroscopy experiments are provided to shed light on the electronic structures of these iron complexes.

Original languageEnglish (US)
Pages (from-to)462-469
Number of pages8
StatePublished - 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd


  • Density functional theory
  • Iron complexes
  • Mössbauer spectroscopy
  • Redox active ligands
  • X-ray crystallography


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