Low-temperature magnetic properties of the 2D molecular ferrimagnet N(n-C5H11)(4) [(FeFeIII)-Fe-II(C2O4)(3)]

Fe-57 Mossbauer and magnetometric studies of the molecular ferrimagnet N(n- C5H11)(4) [(FeFeIII)-Fe-II(C2O4)(3)] are indicative of a 2D magnetic charac ter with strong uniaxial anisotropy in the basal plane of the crystal. It i s established that the change in the sign of the net magnetization of this compound is related to a compensation between Fe-III and Fe-II sublattice m agnetizations at T-comp = 31.2 K. The form and parameters of the magnetic H amiltonian describing the temperature dependence of the Fe-III sublattice a nd the net magnetizations are determined. (C) 1999 American Institute of Ph ysics. [S0021-3640(99)00922-6].