Two 1D carboxylate–bridged magnets displaying solvent-dependent canted antiferromagnetic ordering
Two one dimensional (1D) carboxylate–bridged complexes [Mn(TAc)2(H2O)] (1, HTAc=thymine-1-acetic acid ) and [Mn(TAc)2(DMF)]•0.5H2O (2) were synthesized under different solvothermal conditions, which are sensitive to the solvents and pH values. Two complexes have similar 1D chain-like structure but different terminal solvent molecules (H2O for 1 and DMF for 2), and complex 1 can be converted irreversibly to 2 from single crystal to single crystal. The magnetic studies reveal that 1 and 2 display solvent-dependent magnetic behaviors. 1 experiences spin-canted and long-range antiferromagnetic ordering at TC = 38 K and TN= 8 K when decreasing temperature, while 2 only displays long-range antiferromagnetic ordering at TN= 8 K. The difference may be attributed to the terminal H2O in 1 having a greater polarity and smaller steric hindrance than the DMF molecule in 2, resulting in a more compact stacking structure of the 1D chains and more distorted octahedral geometry of MnII ion to facilitate the occurrence of the spin canted behavior.