Synthesis, crystal structures, and magnetic properties of two cyano-bridged heterobimetallic complexes with camphor derivative ligands

A cyano-bridged trinuclear (Cu2FeIII)-Fe-II complex [{Cu(D,L-La)(2)}(2)Fe(CN)(6)] (ClO4) (1) (La=1,2,2-trimethylcyclopentane-1,3-diamine) and a cyano-bridged binuclear Mn-III-Fe-III complex [Mn(D,L-Lb)(DMF)(Tp)Fe(CN)(3)] center dot (H2O)(6) (2) (Lb=cis-N,N'-(2-Hydroxybenzylidene)-1,2,2-trimethylcyclopenta-1,3-diamine) have been prepared and characterized. X-ray crystal structure analysis for complex I reveals that the copper ion is penta-coordinated by a D- and a L-diamine ligand, and two copper ions are bridge-connected by two cyanides from [Fe(CN)(6)](3-) in axial position. It shows a two-dimensional supramolecular network through hydrogen-bonding interaction. In complex 2, the manganese ion is six-coordinated by two oxygen atoms and two nitrogen atoms from a quadridentate ligand Lb, as well as one oxygen atom from DMF and one cyanide nitrogen atom from [(Tp)Fe(CN)(3)](-) in axial positions. Magnetic study shows intramolecular ferromagnetic interactions in complex 1. The best-fit for chi T-M vs T using the model, (H) over cap=-2J((S) over cap (1) center dot (S) over cap (1) + (S) over cap (2) center dot (S) over cap (3)), leads to the parameters J=0.551 cm(-1) and g=2.190.