Magnetic order in a CuII–DyIII oxamato-based two-dimensional coordination polymer

Abstract

We report the synthesis, crystal structure, and magnetic characterization of a novel two-dimensional copper(II)–dysprosium(III) coordination polymer of formula [Li I (OH 2 ) 4 ] 2 [Dy III Cu II 2 (Me 2 pma) 4 Cl(H 2 O)] . 4H 2 O ( 1 ) [Me 2 pma = N -2,6-dimethylphenyloxamate]. Compound 1 was obtained using the mononuclear anionic complex [Cu II (Me 2 pma) 2 ] 2– , as a bis(bidentate) metalloligand toward solvated dysprosium(III) cations, and it shows a square [Dy III Cu II 2 ] layered structure of (4 4. 6 2 ) net topology. Interestingly, the combination of two factors, the well-known efficiency of oxamato ligands to transmit strong magnetic couplings between neighboring atoms and such structural topology, is responsible for the observation of a ferromagnetic interaction between copper(II) and dysprosium(III) cations and a magnetic ordering ( T C = 7.5 K), paving the way for the obtention of novel future examples of the still very scarce magnetically ordered lanthanide-based coordination polymers.