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Magnetism: A Supramolecular Function pp 299–321Cite as

1,2,4-Triazoles as Ligands for Iron(II) High Spin ↔ Low Spin Crossovers

Mononuclear, Oligonuclear and Polynuclear Coordination Compounds with 1,2,4-Triazole Derivatives as Ligands

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Part of the book series: NATO ASI Series ((ASIC,volume 484))

Abstract

The 1,2,4-triazoles unite the coordination geometry of both the pyrazoles and the imidazoles. Transition metal complexes of 1,2,4-triazoles also show that the triazole ligands have the property to act as bridge ligands between metal ions in several ways. In addition the ligand-field strength in first-row transition metal complexes produced by the 1,2,4-triazole ring is rather high and comparable to 1,2-diaminoethane (en). For iron(II) complexes this means that the compounds are in the range in which one may find spin equilibria. The spin state at a given temperature, depends on substituents on the triazole ring, other ligands, additional solvent molecules, counter ions and actual geometry. Hexakis(triazole)Fe(II) complexes almost always give a spin transition, either by cooling down from room temperature or by warming up.

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  1. Gorlaeus Laboratories, Leiden Institute of Chemistry, P. O. Box 9502, 2300 RA, Leiden, The Netherlands

    Jaap G. Haasnoot

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  1. Laboratoire des Sciences Moléculaire, Institut de Chimie de la Matière Condensée de Bordeaux, 33 608, Pessac Cedex, France

    Olivier Kahn

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Haasnoot, J.G. (1996). 1,2,4-Triazoles as Ligands for Iron(II) High Spin ↔ Low Spin Crossovers. In: Kahn, O. (eds) Magnetism: A Supramolecular Function. NATO ASI Series, vol 484. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8707-5_16

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  • DOI: https://doi.org/10.1007/978-94-015-8707-5_16

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