Steric and Electronic Control of the Spin State in Three-Fold Symmetric, Four-Coordinate Iron(II) Complexes
Résumé
The three-fold symmetric, four-coordinate iron(II) phosphoraminimato complexes PhB(MesIm)3Fe− N=PRR′R″ (PRR′R″ = PMePh2, PMe2 Ph, PMe3, and PnPr3) undergo a thermally induced S = 0 to S = 2 spincrossover in fluid solution. Smaller phosphoraminimato ligands stabilize the low-spin state, and an excellent correlation is observed between the characteristic temperature of the spincrossover (T1/2) and the Tolman cone angle (θ).....