An unsymmetrical dinuclear scandium complex comprising salophen ligands [H2salophen = N, N'-bis-(salicyl-idene)-1,2-phenyl-enedi-amine]

Volker Lorenz; Phil Liebing; Liane Hilfert; Sabine Busse; Frank T Edelmann

doi:10.1107/S2056989019000094

An unsymmetrical dinuclear scandium complex comprising salophen ligands [H₂salophen = N, N'-bis-(salicyl-idene)-1,2-phenyl-enedi-amine]

Acta Crystallogr E Crystallogr Commun. 2019 Jan 8;75(Pt 2):175-178. doi: 10.1107/S2056989019000094. eCollection 2019 Feb 1.

Authors

Volker Lorenz¹, Phil Liebing¹, Liane Hilfert¹, Sabine Busse¹, Frank T Edelmann¹

Affiliation

¹ Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.

Abstract

Treatment of scandium nitrate tetra-hydrate with the tetra-dentate ligand H₂salophen [N,N'-bis-(salicyl-idene)-1,2-phenyl-enedi-amine] afforded the yellow dinuclear complex Sc(NO₃)₂(μ-salophen)Sc(salophen)(EtOH) or [Sc₂(C₂₀H₁₄N₂O₂)₂(NO₃)₂(C₂H₆O)] (systematic name: (ethanol-κO)bis-(nitrato-κ² O,O'){μ-2,2'-[1,2-phenyl-enebis(nitrilo-methanylyl-idene)]diphenolato-κ⁴ N,N',O,O':κ² O,O'}{2,2'-[1,2-phenyl-enebis(nitrilo-methanylyl-idene)]diphenolato-κ⁴ 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 inter-actions between the two salophen ligands.

Keywords: Schiff base; crystal structure; dinuclear scandium complex; salophen ligand; scandium; π–π stacking.