Identification of seven-coordinate Ln(III) ions in a Ln(III)[15-MC(Fe)(III)(N(shi))-5](OAc)(2)Cl species crystallized from methanol and pyridine

The title metallacrown (MC) complexes Ln(III)[15-MC(Fe(III)N(shi))-5](OAc)(2)CI(C(5)H(5)N)(6) (Ln1), where OAc(−) is acetate, shi(3−) is salicylhydroximate, and Ln = Gd and Dy, were synthesized via a self-assembly reaction in methanol and pyridine. Single crystals were grown using slow evaporation and characterized using X-ray diffraction. Seven-coordinate capped octahedron geometries were observed for the lanthanide ion in both complexes, which is uncommon for trivalent lanthanide species. The 15-MC-5 is a ruffled metallacrown archetype similar to previously reported mixed-valent manganese metallacrowns.