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Issue 20, 2016
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Probing bistability in FeII and CoII complexes with an unsymmetrically substituted quinonoid ligand

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Abstract

The generation of molecular platforms, the properties of which can be influenced by a variety of external perturbations, is an important goal in the field of functional molecular materials. We present here the synthesis of a new quinonoid ligand platform containing an [O,O,O,N] donor set. The ligand is derived from a chloranilic acid core by using the [NR] (nitrogen atom with a substituent R) for [O] isoelectronic substitution. Mononuclear FeII and CoII complexes have been synthesized with this new ligand. Results obtained from single crystal X-ray crystallography, NMR spectroscopy, (spectro)electrochemistry, SQUID magnetometry, multi-frequency EPR spectroscopy and FIR spectroscopy are used to elucidate the electronic and geometric structures of the complexes. Furthermore, we show here that the spin state of the FeII complex can be influenced by temperature, pressure and light and the CoII complex displays redox-induced spin-state switching. Bistability is observed in the solid-state as well as in solution for the FeII complex. The new ligand presented here, owing to the [NR] group present in it, will likely have more adaptability while investigating switching phenomena compared to its [O,O,O,O] analogues. Thus, such classes of ligands as well as the results obtained on the reversible changes in physical properties of the metal complexes are likely to contribute to the generation of multifunctional molecular materials.

Graphical abstract: Probing bistability in FeII and CoII complexes with an unsymmetrically substituted quinonoid ligand

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Publication details

The article was received on 25 Feb 2016, accepted on 06 Apr 2016 and first published on 06 Apr 2016


Article type: Paper
DOI: 10.1039/C6DT00757K
Citation: Dalton Trans., 2016,45, 8394-8403
  • Open access: Creative Commons BY license
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    Probing bistability in FeII and CoII complexes with an unsymmetrically substituted quinonoid ligand

    M. van der Meer, Y. Rechkemmer, F. D. Breitgoff, S. Dechert, R. Marx, M. Dörfel, P. Neugebauer, J. van Slageren and B. Sarkar, Dalton Trans., 2016, 45, 8394
    DOI: 10.1039/C6DT00757K

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