[Ni(en)(H2O)(4)] [SO4]center dot 2H(2)O - an S=1 molecular magnet with easy-plane anisotropy

Structural analysis of [Ni(en)(H2O)(4)][SO4]center dot 2H(2)O was performed and it suggests that the crystal field should play a dominant role in the magnetic properties of the system. This conjecture coincides well with the specific heat and susceptibility behaviour. The analysis confirmed that the compound can be treated as a spin 1 single molecule magnet with nonmagnetic ground state introduced by easy-plane single-ion anisotropy D/k(B) approximate to 11 K and neglecting in-plane anisotropy E/D < 0.1.