Abstract
AbstractThe new dianionic dinickel(II) complex [NBu4]2[Ni2(L)2] {L3– = trianionic form of 3,5‐di‐tert‐butyl‐2‐hydroxy‐N‐(2‐hydroxyethyl)benzamide} has been synthesised and characterised by 1H, 13C NMR and IR spectroscopy, mass spectrometry, elemental analysis and X‐ray crystallography. The X‐ray structure of [NBu4]2[Ni2(L)2]·EtOH·CH3CN reveals a quasiplanar dinickel(II) dianionic complex, each of the NiII ions possessing a NO3 planar coordination sphere that results from the ligation of L3– in a NO2 fashion through the N‐amidate, O‐phenolate and O‐bridging alcoholate donor atoms. The cyclic voltammogram of [Ni2(L)2]2– reveals two one‐electron reversible oxidation processes at relatively low potentials. The EPR and UV/Vis spectroscopic characterisations of the electrochemically generated one‐electron‐ and two‐electron‐oxidised products are consistent with two ligand‐based oxidation processes leading to the formation of relatively stable mono‐ and diphenoxyl radical complexes, [Ni2(L·)(L)]– and [Ni2(L·)2], respectively.
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