Penta-kis-(μ3-N,2-di-oxido-benzene-1-car-box-imid-ato)di-μ2-formato-penta-kis-(1H-imidazole)-methanolpenta-manganese(III)man-gan-ese(II)-methanol-water (1/3.36/0.65)

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

The title metallacrown (MC) complexes LnIII[15-MCFeIIIN(shi)-5](OAc)2CI(C5H5N)6 (Ln1), where OAc- is acetate, shi3- 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.

Bis(di-methyl-formamide)-penta-kis-(μ-N,2-dioxido-benzene-1-carb-ox-imidato)tetra-kis-(1-methyl-imidazole)di-μ-propionato-penta-manganese(III)manganese(II)-di-methyl-formamide-methanol (1/0.24/1.36)

The title compound [Mn6(C7H4NO3)5(C3H5O2)2(C4H6N2)4.17(C3H7NO)1.83]·0.24C3H7NO·1.36CH3OH or Mn(II)(C3H5O2)2[15-MCMn(III)N(shi)-5](Me-Im)4.17(DMF)1.83·0.24DMF·1.36MeOH (where MC is metallacrown, shi(3-) is salicyl-hydroximate, Me-Im is 1-methyl-imidazole, DMF is N,N-di-methyl-formamide, and MeOH is methanol), contains an Mn(II) ion in the central cavity and five Mn(III) ions in the MC ring. The central Mn(II) ion is seven coordinate and has a geometry best described as distorted face-capped trigonal prismatic with Φ angles of 6.13, 10.36, and 11.73° and an estimated average s/h ratio of 1.03±0.11. Four of the ring Mn(III) ions are six coordinate with distorted octa-hedral geometries. Two of the Mn(III) ions have Λ absolute stereoconfiguration, while the other two Mn(III) ions have a planar configuration. The fifth Mn(III) ion is five coordinate and has a distorted square pyramidal geometry with τ = 0.20. Three of the Mn(III) ions bind one 1-methyl-imidazole ligand. Two of the ring Mn(III) ions have a 1-methyl-imidazole and a DMF disordered over a coordination site. For one of the ring Mn(III) ions, the occupancy ratio of the ligands refines to 0.51 (1):0.49 (1) in favor of the DMF. For the other ring Mn(III) ion, the occupancy ratio of the ligands refines to 0.68 (1):0.32 (1) in favor of the 1-methyl-imidazole. Two propionate anions serve to bridge the central Mn(II) ion between two different Mn(III) ions. The methyl groups of the bridging propionate anions are disordered over two positions. The methyl group disorder also induces disorder in the H atoms of the adjacent methyl-ene C atom to the same degree. For one of the propionate anions, the occupancy ratio refines to 0.752 (8):0.248 (8) and for the second, the occupancy ratio refines to 0.604 (6):0.396 (6). In addition, the disorder of the methyl group of the latter propionate anion is correlated with a partially occupied [0.604 (6)] methanol mol-ecule. Furthermore, a methanol mol-ecule and a DMF mol-ecule are positionally disordered in the lattice. The occupancy refines to 0.757 (7):0.243 (7) in favor of the methanol mol-ecule. Correlated to the occupancy of the methanol and DMF mol-ecules is a disordered benzene ring of one salicyl-hydroximate ligand. The benzene ring is disordered over two positions with an occupancy ratio of 0.757 (7):0.243 (7). Lastly, the two lattice methanol mol-ecules are hydrogen bonded to the 15-MC-5 mol-ecule. For the partially occupied methanol mol-ecule associated with the disordered propionate anion, the hydroxyl group of the methanol is hydrogen bonded to a carboxyl-ate O atom of the propionate anion. For the partially occupied methanol mol-ecule associated with the partially occupied lattice DMF mol-ecule, the hydroxyl group of the methanol is hydrogen bonded to the phenolate O atom of a salicyl-hydroximate ligand and to the carbonyl O atom of a coordinated DMF mol-ecule.

μ3-Acetato-μ2-acetato-(di-methyl-form-amide)-penta-kis-(μ-N,2-dioxido-benzene-1-carboximidato)penta-kis-(1-methyl-1H-imidazole)-penta-manganese(III)manganese(II)-diethyl ether-di-methyl-formamide-methanol-water (1/1/1/1/0.49)

The title compound, [Mn6(C7H4NO3)5(CH3CO2)2(C4H6N2)4.62(C3H7NO)1.38]·(C2H5)2O·C3H7NO·CH3OH·0.49H2O or Mn(II)(OAc)2[15-MCMn(III)N(shi)-5](Me-Im)4.62(DMF)1.38·diethyl ether·DMF·MeOH·0.49H2O (where MC is metallacrown, (-)OAc is acetate, shi(3-) is salicyl-hydroximate, Me-Im is 1-methyl-imidazole, DMF is N,N-di-methyl-formamide, and MeOH is methanol), is comprised of five Mn(III) ions in the metallacrown ring and an Mn(II) ion which is encapsulated in the central cavity. Four of the ring Mn(III) ions are six-coordinate with distorted octa-hedral geometries. Two of these Mn(III) ions have a planar configuration, while the other two Mn(III) have Λ absolute stereoconfiguration. The fifth Mn(III) is five-coordinated with distorted square-pyramidal geometry. Four of the ring Mn(III) ions each bind one 1-methyl-imidazole, while the final ring Mn(III) ion binds a DMF solvent mol-ecule in an axial position and located in a trans position is either a Me-Im or a DMF mol-ecule. The occupancy ratio of Me-Im to DMF is 0.62 (2) to 0.38 (2). The central Mn(II) is seven-coordinate with a geometry best described as distorted face-capped trigonal-prismatic. DMF, diethyl ether, MeOH, and water mol-ecules are located in the inter-stitial voids between the metallacrown mol-ecules. The methanol mol-ecule is positionally disordered [0.51 (1):0.49 (1)] and associated with a partially occupied water mol-ecule [0.49 (1)]. This disorder is also associated with the positional disorder of the diethyl ether mol-ecule [0.51 (1):0.49 (1)].