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Hydrothermal reactions of 4,4´-bipyridine, benzoic acid/p-methylbenzoic acid, Ni(NO 3 ) 2  · 6H 2 O and NH 4 OH yielded [Ni(bpy) 1.5 (H 2 O) 2 (BA) 2 ]·H 2 O (1) and [Ni(bpy)(HMBA)(MBA) 2 ] n  (2) (bpy = 4,4´-bipyridine, HBA = benzoic acid, HMBA = p-methylbenzoic acid). The Ni(II) ions of compound 1 are six-coordinated and bridged by 4,4´-bipyridine ligands to form a binuclear structure while complex 2 features polymeric chains which are connected by 4,4´-bipyridine molecules. Variabletemperature magnetic susceptibility measurements from 300 to 30 K showed the presence of weak ferromagnetic interactions between the Ni(II) (S = 1) ions via the 4,4´-bipyridine bridges.

Syntheses, Crystal Structures and Magnetic Properties of Two Nickel(II) Compounds with 4,4´- Bipyridine Ligands