In 2010, a new iron-oxygen species was reported,[1] in which an iron oxygen complex was capped by a Sc3+ moiety. This new species represents a series of complexes where a Lewis acid is binding to an metal-bound oxygen or nitrogen. Through extensive molecular modelling[2] of FeIV-oxo, FeIII-oxo and FeIII-hydroxo complexes and the new species, it was shown unambiguously that the oxidation state of iron in this Lewis-acid capped metal-bound oxygen system is +III, coinciding with water as secondary axial ligand to scandium. This has been recently confirmed through Mössbauer spectroscopy experiments,[3] which confirmed the predicted values for the isomer shift and quadrupole splitting. Here we report new results[4] for other hetero-bimetallic complexes, with Lewis-acid bound metal-nitrogen or metal-oxygen complexes. The effect of the Lewis-acid on reactivity, oxidation state and spectroscopy will be discussed. Financial support by ICREA, MINECO, GenCat and COST (CM1305) is gratefully acknowledged. References 1. Fukuzumi, Morimoto, Kotani, Naumov, Lee, Nam, Nature Chem. 2010, 2, 756 2. Swart, Chem. Commun. 2013, 49, 6650 3. Prakash, Rohde, Meier, Jasniewski, van Heuvelen, Münck, Que Jr., J. Am. Chem. Soc. 2015, 137, 3478 4. Swart, Gruden, Ray, Meyer, 2015/2016, in preparation.

Effect of Lewis acids on transition metal complexes

251st National Meeting (2016)

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