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Issue 9, 2012
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Electrochemical, spectroscopic, magnetic and structural studies of complexes bearing ferrocenyl ligands of N-(3-hydroxypicolinoyl)picolinamide

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Abstract

The synthesis and in-depth characterisation including X-ray crystallography of a new hydroxy derivative of bis(2-pyridylcarbonyl)amine Hbpca, namely N-(3-hydroxypicolinoyl)picolinamide (Hbpca-OH), as well as two ferrocenyl derivatives of Hbpca-OH, namely 2-(picolinoylcarbamoyl)pyridin-3-yl ferrocenoate (HL1) and bis(2-(picolinoylcarbamoyl)pyridin-3-yl) 1,1′-ferrocenoate (H2L2), is reported. HL1 and H2L2 were complexed with five different transition metal cations, namely Fe2+, Zn2+, Ni2+, Cu2+ and Cu+, to give ten complexes with varying stoichiometries, which were characterised by different analytical methods including 1H NMR, ESI-MS, IR spectroscopy and microanalysis. The metal complexation was also confirmed by electrochemical measurements for all complexes except Zn(L1)2 and FeL2, for which the changes in formal redox potentials of ferrocene ΔE°′ observed were not significant enough. Furthermore, two X-ray structures of CuII complexes, namely [Cu2I2L12] and [Cu2I2L2]n, were determined. Both structures contain an extremely rare CuII–I2–CuII bridge. Finally, a small antiferromagnetic coupling in [Cu2I2L2]n was observed.

Graphical abstract: Electrochemical, spectroscopic, magnetic and structural studies of complexes bearing ferrocenyl ligands of N-(3-hydroxypicolinoyl)picolinamide

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Publication details

The article was received on 07 Mar 2012, accepted on 12 Jun 2012 and first published on 13 Jun 2012


Article type: Paper
DOI: 10.1039/C2NJ40177K
Citation: New J. Chem., 2012,36, 1819-1827
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    Electrochemical, spectroscopic, magnetic and structural studies of complexes bearing ferrocenyl ligands of N-(3-hydroxypicolinoyl)picolinamide

    G. Gasser, C. Mari, M. Burkart, S. J. Green, J. Ribas, H. Stoeckli-Evans and J. H. R. Tucker, New J. Chem., 2012, 36, 1819
    DOI: 10.1039/C2NJ40177K

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