Structural and Magnetic Properties of Dimeric Capsule Assemblies Formed by Cyclic Trinuclear Complexes.

Cyclic trinuclear homo-metal complexes, [{Fe(LBr)py}] () and [{Mn(LBr)}(py) MeOH] (), along with a hetero-metal complex, [FeMn(LH)(DMF)] (), were synthesized using asymmetric ditopic ligands (HLH: 2-(2-hydroxyphenyl)-6-ol-5-(salicylideneamino)benzoxazole, HLBr: 2-(2-hydrox-5-bromoyphenyl)-6-ol-5-(5-bromosalicylideneamino)benzoxazole). The molecular structure of is characterized by a tripod structure with three-fold symmetry, where an enantiomer pair forms a dimeric capsule with dimensions of approximately 3 × 1.6 × 1.6 nm. Complexes and , which lack three-fold symmetry, exhibit similar molecular structures to previously reported complexes with these ligands, but do not form a capsule structure. Magnetic measurements of - reveal the presence of significantly weak antiferromagnetic interactions between the metal ions.