Thermally Induced Oxidation of [Fe^II(tacn)₂](OTf)₂ (tacn = 1,4,7-triazacyclononane).

ABSTRACT: We previously reported the spin-crossover (SC) properties of [Fe^II(tacn)₂](OTf)₂ (1) (tacn = 1,4,7-triazacyclononane) [Eur. J. Inorg. Chem. 2013, 2115]. Upon heating under dynamic vacuum, 1 undergoes oxidation to generate a low spin iron(III) complex. The oxidation of the iron center was found to be facilitated by initial oxidation of the ligand via loss of an H atom. The resulting complex was hypothesized to have the formulation [Fe^III(tacn)(tacn-H)](OTf)₂ (2) where tacn-H is N-deprotonated tacn. The formulation was confirmed by ESI-MS. The powder EPR spectrum of the oxidized product at 77 K reveals the formation of a low-spin iron(III) species with rhombic spectrum (g = 1.98, 2.10, 2.1

SUBMITTER: Li J 

PROVIDER: S-EPMC6221196 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature