Supramolecular heteropolymetallic assemblies constructed from binuclear complexes and hexacyanometallate anions. Synthesis, crystal structure and magnetic properties of [Cu-2(fsal-33)(H2O)(2)](3)[Fe(CN)(6)](2)center dot 8 H2O

A supramolecular heteropolymetallic system, [Cu-2(fsal-33)(H2O)(2)](3)[Fe(C N)(6)](2). 8H(2)O (1), was obtained by reacting K-3[Fe(CN)(6)] with [Cu-2(f sal-33)(H2O)(2)](ClO4)(2) (H(2)fsal-33 is the symmetric macrocyclic binucle ating Schiff base ligand obtained by condensation of 2,6-diformyl-4-methylp henol with 1,3-propylenediamine). The crystallographic investigation of 1 r eveals a complex three-dimensional structure based on hydrogen-bond interac tions between the aqua ligands coordinated to the copper atoms, the water m olecules, and the cyano groups arising from the hexacyanoferrate(III) anion s. The cryomagnetic measurements reveal the strong antiferromagnetic intera ction between the copper(II) ions within the binuclear cationic entity, and the temperature dependence of the chi(M)T product, which is due to the fir st-order orbital momentum associated with low-spin Fe(III).