Hetero‐Tetranuclear Cu²⁺/Ca²⁺/Ca²⁺/Cu²⁺ Architectures Based On Malten Ligand: Scaffold for Anion Binding

The hetero‐tetranuclear Cu 2+ /Ca 2+ /Ca 2+ /Cu 2+ complex obtained with the N,N’‐bis((3‐hydroxy‐4‐pyron‐2‐yl)methyl)‐N,N’‐dimethylethylendiamine (Malten) ligand has been studied in solid and solution states as scaffold to bind anions. Three crystal structures showing the same metal ions sequence have been examined; they display a tetracharged complex cation neutralized by four monocharged anions. The anions play two different roles: as...