Syntheses, structures, and magnetic properties of heterobimetallic Fe2IIIMII (M = Cu, Mn) chains based on tetracyanometallic building block

Using the tetracyanometalate precursor [Fe(4,4′-dmbipy)(CN)4]- (4,4′-dmbipy = 4,4′-dimethyl-2,2′-bipyridine) as the building block, two new cyano-bridged one-dimensional heterobimetallic coordination polymers, [M(CH3OH)2Fe2(4,4′-dmbipy)2(CN)8]n (M = Cu, 1; Mn, 2), have been synthesized and structurally characterized. X-ray crystallography reveals that complexes 1 and 2 consist of heterobimetallic chains of squares, and the central MII ion is six-coordinated as an elongated distorted octahedral geometry. Magnetic studies show ferromagnetic coupling between FeIII and CuII ions in complex 1. Complex 2 exhibits ferrimagnetic behavior caused by the noncompensation of the local interacting spins (SMn = 5/2 and SFe = 1/2), which interact antiferromagnetically through bridging cyanide groups. magpack program has been employed to investigate the magnetic nature of squares chain structure.