FERROMAGNETICALLY COUPLED DIMER OF NI(II) WITH A SINGLET GROUND-STATE - SUSCEPTIBILITY AND EPR STUDY

The structure of [Ni(terpy)(N3)2]2·2H2O consists of isolated dimeric units where two nickel (II) ions are linked through the N-end of two N-azide bridging groups. Magnetic susceptibility measurements show the existence of ferromagnetic exchange between nickel centers. The magnetic parameters determined are: J/K = 28.8 K, D/K = -17.9 K, Z′J′/K = 0.38 K and g = 2.26. The EPR spectrum confirms the existence of a true single ground state S = 2, Ms = 0 because of the zero-field splitting. © 1990.