Abstract
Mn ( hfipbb ) py ( H 2 O ) 0.5 [H2hfipbb=4, 4′-(hexafluoroisopropylidene)bis(benzoic acid), py=pyridine] is a recently discovered metal-organic coordination network. The crystal structure of this compound belongs to a triclinic space group P-1, and the lattice parameters are a=12.988Å, b=13.296Å, c=14.644Å, α=115.13°, β=95.61°, and γ=101.03°. Two crystallographically independent Mn atoms (Mn1 and Mn2) exist in this structure, and an alternate connection (–Mn1–Mn2–Mn1–Mn2–) through organic units along the x axis leads to a one-dimensional Mn2+ chain. Magnetic susceptibility M(T)∕H and isothermal magnetization M(H) were measured on single-crystal samples, as well as on powder samples of Mn(hfipbb)py(H2O)0.5. Antiferromagnetic ordering was observed below a transition temperature of TN=9.0K. High-temperature susceptibility data for powder samples were fitted to the Curie-Weiss law with θ=−30K and an effective moment of μeff=5.7μB, close to what is expected for a free Mn2+ ion. There is small but clear orientation dependence in the susceptibility data for single-crystal samples. The result of isothermal magnetization measured at 2K is consistent with the interpretation of an antiferromagnetic ground state, and a slope change was seen at a critical field of Hc=18kG, indicating a field-induced moment reorientation of the Mn2+ ions in this compound.
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