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

•A new topology is described for a coordination polymer resulting by connecting anionic binuclear CuII complexes with MnII​.•The 2-D coordination polymer is compared with another 2-D coordination polymer obtained in different conditions.•The magnetic investigation reveals strong CuII–CuII aniferromagnetic interactions.

The self-assembly process between the binuclear [Cu2(HL)(L)]− complex and the manganese(II) ion affords a two-dimensional coordination polymer of formula [Mn{Cu2(HL)(L)}2(H2O)2]n (1) (H3L = 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{Cu2(HL)(L)}2(H2O)4]·4H2O·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 = −JSCu1·SCu2], a value which is as expected in the light of a recent magneto-structural correlation for bis(phenoxido)dicopper(II) complexes.

Graphical abstractThe self-assembly process between binuclear [Cu2(HL)((L)]− complexes and manganese(II) ions affords a 2-D coordination polymer, [Mn{Cu2(HL)(L)}2(H2O)2] 1 (H3L stands for the oxime of 3-formyl-salicylic acid).Figure optionsDownload full-size imageDownload as PowerPoint slide