An unsymmetrical dinuclear scandium complex comprising salophen ligands [H 2 salophen = N, N ′-bis(salicylidene)-1,2-phenylenediamine]

Abstract

Treatment of scandium nitrate tetrahydrate with the tetradentate ligand H 2 salophen [N,N′-bis(salicylidene)-1,2-phenylenediamine] afforded the yellow dinuclear complex Sc(NO 3) 2 (μ-salophen)Sc(salophen)(EtOH) or [Sc 2 (C 20 H 14 N 2 O 2) 2 (NO 3) 2 (C 2 H 6 O)] (systematic name: (ethanol-κO)bis(nitrato-κ 2 O,O′){μ-2,2′-[1,2-phenylenebis(nitrilomethanylylidene)]diphenolato-κ 4 N,N′,O,O′:κ 2 O,O′}{2,2′-[1,2-phenylenebis(nitrilomethanylylidene)]diphenolato-κ 4 O,N,N′,O′}discandium). In this compound, one salophen ligand displays a bridging coordination via 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 interactions between the two salophen ligands.