An unsymmetrical dinuclear scandium complex comprising salophen ligands [H 2 salophen = N , N '-bis-(salicyl-idene)-1,2-phenyl-enedi-amine]

Treatment of scandium nitrate tetra-hydrate with the tetra-dentate ligand H salophen [ , '-bis-(salicyl-idene)-1,2-phenyl-enedi-amine] afforded the yellow dinuclear complex Sc(NO ) (μ-salophen)Sc(salophen)(EtOH) or [Sc (C H N O ) (NO ) (C H O)] (systematic name: (ethanol-κ )bis-(nitrato-κ , '){μ-2,2'-[1,2-phenyl-enebis(nitrilo-methanylyl-idene)]diphenolato-κ , ', , ':κ , '}{2,2'-[1,2-phenyl-enebis(nitrilo-methanylyl-idene)]diphenolato-κ , , ', '}discandium). In this compound, one salophen ligand displays a bridging coordination the two oxygen atoms, while the other salophen ligand is attached to only one Sc center. This arrangement is stabilized by a hydrogen-bonded EtOH co-ligand, and by π-π stacking inter-actions between the two salophen ligands.