Chain Compounds Based on Tetranuclear Basic Copper(II) Carboxylate Clusters and Quadruple Zwitterionic Linkers: Structures and Magnetic Properties

Abstract

Abstract Two Cu II complexes with the new zwitterionic ligand 1‐carboxymethylpyridinio‐3‐benzoate ( L ), [Cu 4 L 4 (OH) 2 ](ClO 4 ) 2 · 8H 2 O ( 1 ) and [Cu 4 L 4 (OH) 2 ]Cl 2 · 8H 2 O ( 2 ), have been synthesized and characterized crystallographically and magnetically. The two compounds contain isostructural chains, in which the anionic basic copper(II) carboxylate clusters [Cu 4 (μ 3 ‐OH) 2 (RCOO) 8 ] 2– are quadruply interlinked by cationic organic spacers. Magnetic analyses using a tetranuclear model indicate that antiferromagnetic interactions between neighboring copper(II) ions are operative through the double hydroxo bridges and the mixed hydroxo/carboxylato bridges.