A two-dimensional coordination polymer constructed from binuclear copper(II) metalloligands and manganese(II) ions: Synthesis, crystal structure and magnetic properties

Abstract The self-assembly process between the binuclear [Cu 2 (HL)(L)] − complex and the manganese(II) ion affords a two-dimensional coordination polymer of formula [Mn{Cu 2 (HL)(L)} 2 (H 2 O) 2 ] n ( 1 ) (H 3 L = 3-hydroxyiminomethylsalicylic acid) where parallel ladder-like motifs of defective double cubanes of bis(phenoxo)dicopper(II) units as rods and anti-syn carboxylato bridges as rungs act as ligands towards tetraaqua-manganese(II) entities through the deprotonated oxime groups. The topology of 1 is compared with the one of another compound, [Mn{Cu 2 (HL)(L)} 2 (H 2 O) 4 ]·4H 2 O·2DMF ( 1′ ) which was obtained in different conditions by Okawa et al. (J. Chem. Soc., Dalton Trans. (2001) 3119). Magnetic susceptibility measurements of 1 in the temperature range 2.0–300 K are practically determined by the occurrence of a very large antiferromagnetic coupling between the two copper(II) ions through the double phenoxido bridge [ J  = −765(5) cm −1 , the spin Hamiltonian being defined as H  = − J S Cu1 · S Cu2 ], a value which is as expected in the light of a recent magneto-structural correlation for bis(phenoxido)dicopper(II) complexes.