Synthesis, Crystal\nStructure, and Magnetic Properties\nof Polynuclear Salamo Ni(II) Complexes

Four distinct polynuclear Ni(II) complexes, namely [Ni<sub>2</sub>L<sub>2</sub>(py)<sub>2</sub>] (<b>1</b>), [Ni<sub>3</sub>L<sub>2</sub>(μ<sub>3</sub>-OAc)<sub>2</sub>]·4CH<sub>3</sub>CN (<b>2</b>), [Ni<sub>4</sub>L<sub>2</sub>(μ<sub>2</sub>-OAc)<sub>2</sub>(μ<sub>3</sub>-OMe)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·MeOH (<b>3</b>), and [Ni<sub>7</sub>L<sub>3</sub>(μ<sub>3</sub>-OMe)<sub>2</sub>(μ<sub>3</sub>-OH)<sub>6</sub>(MeOH)<sub>6</sub>] (<b>4</b>), have been synthesized\nand characterized based on the salamo Schiff base ligand H<sub>2</sub>L. Ultraviolet–visible titration experiments and time-dependent\ndensity functional theory calculations elucidated that different reaction\nconditions (solvents and the metal–ligand molar ratio) result\nin the formation of these polynuclear structures. Magnetic investigations\nrevealed the presence of intramolecular ferromagnetic coupling between\nNi(II) centers in complexes <b>2</b>–<b>4</b>.