Trinuclear Diamagnetic Nickel(II) Complexes with Bridging 3‐Arylpyrazolato Ligands

Abstract

AbstractOrange‐red trinuclear nickel(II) complexes are obtained by reacting Ni(ClO4)2(H2O)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, IR, fluorescence, and X‐ray spectroscopy. All seven compounds described here were structurally elucidated by single‐crystal X‐ray diffraction. With 3(5)‐ferrocenylpyrazole as the substrate, a nonametallic system that possesses six redox‐active ferrocenyl moieties was obtained.