Syntheses and characterization of two novel heptanuclear trigonal prismatic LnNi6 clusters with different terminal ligands

Two novel heptanuclear trigonal prismatic LnNi6 clusters, [SmNi6(Gly)6(Ac)(μ3-OH)3(μ2-H2O)2(im)6] · (ClO4)5 · (H2O)5 (1) and [GdNi6(Gly)6Cl3(OH)3(py)6] · Cl · (ClO4)2 · (H2O)5 (2), were synthesized through self-assembly, and were characterized by X-ray structure analyses. Complex 1 crystallizes in the monoclinic Cc space group (a = 17.9722(3) Å, b = 16.3906(2) Å, c = 25.3463(3) Å, β = 99.832(1)° and Z = 4). Complex 2 attributes to the monoclinic P2(1)/c space group (a = 15.5408(2) Å, b = 20.0516(4) Å, c = 23.8204(4) Å, β = 100.096(1)° and Z = 4). 1 has six terminal imidazole ligands, while 2 has six terminal pyridine ligands. The two complexes both have a [LnNi6(Gly)6(μ3-OH)3]6+ core. The magnetic measurements reveal that 1 exhibits an overall antiferromagnetic interaction, while 2 exhibits a ferromagnetic interaction.

Two novel heptanuclear trigonal prismatic LnNi6 clusters with the same [LnNi6(Gly)6(μ3-OH)3]6+ core but different terminal aromatic ligands were prepared.Figure optionsDownload as PowerPoint slide