Abstract
Cyclic trinuclear homo-metal complexes, [{Fe(L(3+2)Br)py}(3)] (1) and [{Mn(L(3+2)Br)}(3)(py)(2) MeOH] (2), along with a hetero-metal complex, [FeMn(2)(L(3+2)H)(3)(DMF)(3)] (3), were synthesized using asymmetric ditopic ligands (H(3)L(3+2)H: 2-(2-hydroxyphenyl)-6-ol-5-(salicylideneamino)benzoxazole, H(3)L(3+2)Br: 2-(2-hydrox-5-bromoyphenyl)-6-ol-5-(5-bromosalicylideneamino)benzoxazole). The molecular structure of 1 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(3). Complexes 2 and 3, 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 1-3 reveal the presence of significantly weak antiferromagnetic interactions between the metal ions.