A series of tetraazalene radical-bridged M₂ (M = Cr^III, Mn^II, Fe^II, Co^II) complexes with strong magnetic exchange coupling.

ABSTRACT: The ability of tetraazalene radical bridging ligands to mediate exceptionally strong magnetic exchange coupling across a range of transition metal complexes is demonstrated. The redox-active bridging ligand N,N',N'',N'''-tetra(2-methylphenyl)-2,5-diamino-1,4-diiminobenzoquinone (^NMePhLH₂) was metalated to give the series of dinuclear complexes [(TPyA)₂M₂(^NMePhL^2-)]²⁺ (TPyA = tris(2-pyridylmethyl)amine, M = Mn^II, Fe^II, Co^II). Variable-temperature dc magnetic susceptibility data for these complexes reveal the presence of weak superexchange interactions between metal centers, and fits to the data provide coupling constants of J = -1.64(1) and -2.16(2

SUBMITTER: DeGayner JA 

PROVIDER: S-EPMC5802272 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature