Issue 5, 2016

Six- and seven-coordinate Fe(ii) and Zn(ii) compounds ligated by unsymmetric xanthene-based ligands: characterization and magnetic properties

Abstract

The synthesis of a set of novel unsymmetric ligands, iXa and iXa-2, and of their corresponding FeII and ZnII complexes are described. The ligands incorporate a redox-active α-diimine moiety alongside (2-pyridylmethyl)amino groups. Electrochemical data highlight ligand-centered reduction processes available in these systems. The molecular structures of the series of six- and seven-coordinate metal complexes reveal a pentagonal bipyramidal geometry for all compounds. The ligands and complexes were further characterized in the solution state by NMR spectroscopy, with assignments supported by DFT calculations. The ferrous-iXa and -iXa-2 complexes have a high spin, S = 2 configuration. Magnetic susceptibility studies reveal the unusual low-temperature ferromagnetism of these complexes. Intermolecular interactions between the iron centers are mediated by the PF6 counterions, as evidenced by 31P-NMR studies.

Graphical abstract: Six- and seven-coordinate Fe(ii) and Zn(ii) compounds ligated by unsymmetric xanthene-based ligands: characterization and magnetic properties

Supplementary files

Article information

Article type
Research Article
Submitted
21 12 2015
Accepted
29 1 2016
First published
04 2 2016

Inorg. Chem. Front., 2016,3, 616-629

Six- and seven-coordinate Fe(II) and Zn(II) compounds ligated by unsymmetric xanthene-based ligands: characterization and magnetic properties

R. M. Haas, M. Arshad, J. Anthony, P. J. Altmann, A. Pöthig, F. H. Köhler and C. R. Hess, Inorg. Chem. Front., 2016, 3, 616 DOI: 10.1039/C5QI00298B

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