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Heteroleptic Pyridyl-Carbene Iron Complexes with Tuneable Electronic Properties

Abstract : New heteroleptic iron complexes mixing a terpyridine bearing a protonable pyridyl substituent (pytpy) and a pyridyl carbene ligand (carb) have been prepared and characterised by UV/Vis spectroscopy, cyclic voltammetry and TD-DFT computations. The absorption spectrum of [Fe(carb)(pytpy)](2+) showed a notable redshift compared with the homoleptic [Fe(carb)(2)](2+) complex. The MLCT transition occurred at even lower energy when the pendant pyridine was protonated, leading to a wide absorption domain in the 450-650 nm range. Calculations revealed the strong propensity of excited electrons to move from the metal to the pytpy ligand in the complex. This new family of complexes is a promising addition to the arsenal of iron-based chromophores with tuneable electronic properties.
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Thibaut Duchanois, Thibaud Etienne, Marc Beley, Xavier Assfeld, Eric A. Perpete, et al.. Heteroleptic Pyridyl-Carbene Iron Complexes with Tuneable Electronic Properties. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2014, pp.3747-3753. ⟨10.1002/ejic.201402356⟩. ⟨hal-01494414⟩



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