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Ion-pair compounds of phenyl-substituted viologen dications with [M(mnt)2] dianions were prepared and characterized. (Benzyl viologen)[M(mnt)2] (M = Cu (1), Ni (2), Pt (3)) and (phenyl viologen)[Cu(mnt)2] (4) exhibited mixed-stack crystal structures, whereas (dinitrophenyl viologen)[Cu(mnt)2] (5) exhibited no pi-pi interactions. Magnetic susceptibility measurements revealed that 1 exhibits a ferromagnetic exchange interaction (Weiss constant theta = +0.9 K), possibly mediated by the diamagnetic cation. Antiferromagnetic interactions were observed for 4 (theta = -2.0 K) and 5 (theta = -2.9 K), whereas 2 and 3 were diamagnetic. Absorption bands assignable to charge transfer were observed in the mixed-stack salts in the visible to near-infrared region.
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate