Three trinuclear complexes, NiIIMnIIINiII1, NiIICrIIINiII2 and NiII33 based on (pyridine-2-aldoximato)nickel(II) units are described. Two of them, 1 and 2, contain metal-centers in linear arrangement, as is revealed by X-ray diffraction. Complex 3 is a homonuclear complex in which the three nickel(II) centers are disposed in a triangular fashion. The compounds were characterized by various physical methods including cyclic voltammetric and variable-temperature (2–290 K) susceptibility measurements. Complexes 1 and 3 display antiferromagnetic exchange coupling of the neighbouring metal centers, while weak ferromagnetic spin exchange between the adjacent NiII and CrIII ions in 2 is observed. The experimental magnetic data were simulated by using appropriate models.
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