Synthesis and crystal structure of a pentacopper(II) 12-metallacrown-4: cis-diaquatetrakis(dimethylformamide-κO)manganese(II) tetrakis(μ3-N,2-dioxidobenzene-1-carboximidate)pentacopper(II) dimethylformamide monosolvate

Abstract

The title compound, [Mn(C3H7NO)4(H2O)2][Cu5(C7H4NO3)4]·C3H7NO or cis-[Mn(H2O)2(DMF)4]{Cu[12-MCCu(II)N(shi)-4]}·DMF, where MC is metallacrown, shi3− is salicylhydroximate, and DMF is N,N-dimethylformamide, crystallizes in the monoclinic space group P21/n. Two crystallographically independent metallacrown anions are present in the structure, and both anions exhibit minor main molecule disorder by an approximate (non-crystallographic) 180° rotation with occupancy ratios of 0.9010 (9) to 0.0990 (9) for one anion and 0.9497 (8) to 0.0503 (8) for the other. Each pentacopper(II) metallacrown contains four CuII ions in the MC ring and a CuII ion captured in the central cavity. Each CuII ion is four-coordinate with a square-planar geometry. The anionic {Cu[12-MCCu(II)N(shi)-4]}2− is charged-balanced by the presence of a cis-[Mn(H2O)2(DMF)4]2+ cation located in the lattice. In addition, the octahedral MnII counter-cation is hydrogen bonded to both MC anions via the coordinated water molecules of the MnII ion. The water molecules form hydrogen bonds with the phenolate and carbonyl oxygen atoms of the shi3− ligands of the MCs.

Keywords

• metallacrown
• copper complex
• salicylhydroximate
• crystal structure