An ion pair uniting a gadolinium(III)–Schiff base complex and uranyl tetrachloride

The Schiff base N-(tert-butyl)-3-methoxy­salicyl­ald­imine (LH) forms a complex with gadolinium(III) chloride, [GdCl₂(LH)₂(C₅H₅N)₂]⁺, in which the two O atoms of each ligand are coordinated (the phenolic O atom being deprotonated) and the imine N atom is protonated and involved in a hydrogen bond with the phenoxide group. This complex crystallizes as an ion pair with uranyl tetrachloride, i.e. bis{bis­[2-(tert-butyl­iminio­methyl)-6-methoxy­phenolato-O,O′]­dichlorobis­(pyridine-N)­gadolinium(III)} tetra­chlorodi­oxo­uran­ium(VI) tetra­pyri­dine solvate [GdCl₂(C₁₂H₁₇NO₂)₂(C₅H₅N)₂]₂[UCl₄O₂]·4C₅H₅N. The U atom of the UCl₄O₂ anion lies on an inversion centre.