Orange-red trinuclear nickel(II) complexes are obtained by reacting Ni(ClO 4 ) 2 (H 2 O) 6 with 3(5)-arylpyrazoles in the presence of a base. Herein, the diamagnetic nickel centers are coordinated in a square-pyramidal manner by four pyrazolato ligands, each of which bridges two nickel sites. The structurally unique complexes were investigated by NMR,
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