Structural and magnetic properties of a syn-anti carboxylate bridged one-dimensional copper(II) complex with ferromagnetic exchange interaction

The compound [Cu(phen)(O2CCF3)(2)](n) (phen = 1,10-phenanthroline) has been synthesized and its crystal structure determined. It crystallizes in monoc linic space group C2/c, with a = 19.229(7), b = 11.281(5), c = 7.621(2) Ang strom, beta = 104.305(12)degrees, and Z = 4. The crystal structure is polym eric, being built from infinite zigzag chains of trifluoroacetate bridged c opper(II), with the phenanthroline ligands being stacked between the chains . The variable-temperature (13-300 K) magnetic susceptibility and ESR data are reported and a weak ferromagnetic exchange interaction is observed with the exchange parameter estimated as J = 2.9 cm(-1).