Scandium SALEN complexes bearing chloro, aryloxo, and hydroxo ligands.

Heteroleptic amide complexes (SALEN)Sc[N(SiHMe2)2] (SALEN = SalentBu,tBu, SalcyctBu,tBu, or SalprentBu,tBu if not stated differently) were examined as synthesis precursors according to silylamine elimination reactions. Treatment of (SALEN)Sc[N(SiHMe2)2] with H2O or phenols (HOArR,R; R = tBu, iPr) afforded complexes [(SALEN)Sc(μ-OH)]2 and (SALEN)Sc(OArR,R), while chloro exchange products were formed from the respective reactions with NH4Cl or AlMe2Cl. Such complexes [(SALEN)Sc(μ-Cl)]2 and (SALEN)ScCl(thf) were also obtained by utilizing alternative synthesis protocols, allowing for controlled donor absence and presence. Heteroleptic amide precursors [Sc(NiPr2)2(μ-Cl)(thf)]2 and [Sc[N(SiHMe2)2]2(μ-Cl)(thf)]2 readily undergo amine elimination reactions with H2SALEN derivatives to form the corresponding chloride complexes. Spectroscopic and X-ray structural data of the heteroleptic scandium complexes revealed an exclusive intramolecular tetradentate coordination mode of the SALEN ligands independent of the SA...