Issue 20, 2016

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

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

Supplementary files

Article information

Article type
Paper
Submitted
25 Feb 2016
Accepted
06 Apr 2016
First published
06 Apr 2016
This article is Open Access
Creative Commons BY license

Dalton Trans., 2016,45, 8394-8403

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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