Synthesis and crystal structure of an iron triazole complex resulting from the unexpected ligand cleavage of a triazolium carbene precursor |
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Authors: | Roman Pacholski Krzysztof Durka Piotr Buchalski |
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Institution: | Warsaw University of Technology,, Warsaw, Poland |
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Abstract: | Typically reactions of N-heterocyclic carbenes with transition metals are straightforward and require a carbene salt, a base strong enough to deprotonate such a salt and a metal. Yet when carbene precursors are in the form of triazolium salts, reaction may not proceed as easily as expected. In our work, we intended to obtain a triazolylidene complex of iron(II) chloride, but due to the presence of small amounts of water in the tetrahydrofuran solvent used, bis(acetonitrile)tetrakis(1-benzyl-1H-1,2,4-triazole-κN4)iron(II) μ-oxido-bistrichloridoferrate(III)] acetonitrile disolvate, Fe(C9H9N3)4(CH3CN)2]Fe2Cl6O]·2CH3CN – an interesting anion with a linear geometry of the O atom – was formed instead of the iron carbene complex. Reaction proceeded via cleavage of the alkyl N-substituent of the triazolium salt. The formation of the product was confirmed by X-ray crystallography. The crystal structure and possible reaction pathways are discussed. |
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Keywords: | crystal structure triazole imine hexachloridooxidodiferrate anion iron complex N-heterocyclic carbene organometallic chemistry |
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