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Schmitz M, Seibel M, Kelm H, et al. How does a coordinated radical ligand affect the spin crossover properties in an octahedral iron(II) complex?. Angew Chem Int Ed Engl. 2014;53(23):5988-92doi: 10.1002/anie.201310484.
Schmitz, M., Seibel, M., Kelm, H., Demeshko, S., Meyer, F., & Krüger, H. J. (2014). How does a coordinated radical ligand affect the spin crossover properties in an octahedral iron(II) complex?. Angewandte Chemie (International ed. in English), 53(23), 5988-92. https://doi.org/10.1002/anie.201310484
Schmitz, Markus, et al. "How does a coordinated radical ligand affect the spin crossover properties in an octahedral iron(II) complex?." Angewandte Chemie (International ed. in English) vol. 53,23 (2014): 5988-92. doi: https://doi.org/10.1002/anie.201310484
Schmitz M, Seibel M, Kelm H, Demeshko S, Meyer F, Krüger HJ. How does a coordinated radical ligand affect the spin crossover properties in an octahedral iron(II) complex?. Angew Chem Int Ed Engl. 2014 Jun 02;53(23):5988-92. doi: 10.1002/anie.201310484. Epub 2014 May 08. PMID: 24810415.
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Angew Chem Int Ed Engl. 2014 Jun 02;53(23):5988-92. doi: 10.1002/anie.201310484. Epub 2014 May 08.

How does a coordinated radical ligand affect the spin crossover properties in an octahedral iron(II) complex?.

Angewandte Chemie (International ed. in English)

Markus Schmitz, Manuel Seibel, Harald Kelm, Serhiy Demeshko, Franc Meyer, Hans-Jörg Krüger

Affiliations

  1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger Strasse 54, 67663 Kaiserslautern (Germany) http://www.chemie.uni-kl.de/fachrichtungen/ac/krueger/

PMID: 24810415 DOI: 10.1002/anie.201310484

Abstract

The influence of a coordinated π-radical on the spin crossover properties of an octahedral iron(II) complex was investigated by preparing and isolating the iron(II) complex containing the tetradentate N,N'-dimethyl-2,11-diaza[3.3](2,6)pyridinophane and the radical anion of N,N'-diphenyl-acenaphtene-1,2-diimine as ligands. This spin crossover complex was obtained by a reduction of the corresponding low-spin iron(II) complex with the neutral diimine ligand, demonstrating that the reduction of the strong π-acceptor ligand is accompanied by a decrease in the ligand field strength. Characterization of the iron(II) radical complex by structural, magnetochemical, and spectroscopic methods revealed that spin crossover equilibrium occurs above 240 K between an S=1/2 ground state and an S=3/2 excited spin state. The possible origins of the fast spin interconversion observed for this complex are discussed.

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: iron(II) complexes; magnetic properties; redox chemistry; spin crossover; π-radical ligands

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