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The title compound, [Ni 4 (C 6 H 5 N 3 O) 2 (C 6 H 6 N 3 O) 2 (C 5 H 5 N) 4 ](NO 3 ) 2 , is a tetra­nuclear nickel complex containing a single-decker cation, located on an inversion center. The two unique Ni II  cations are  N , N ′, N ′′, O -chelated by carbox­imid­amid­ate(2−) and carboximidamidate(1−) anions, forming a distorted four-coordinate planar structure, while the other two Ni II  atoms are  N , N ′, O , O ′-chelated by the same bridging ligands and two pyridine mol­ecules, affording six-coordinated metals in an octa­hedral geometry. The cation is isostructural with the complex crystallized with perchlorate counter-ions in place of nitrate.

acta crystallographica. section e

Bis[μ3-N′-oxidopyridine-2-carboximidamidato(2−)]bis[μ2-N′-oxidopyridine-2-carboximidamidato(1−)]tetrapyridinetetranickel(II) dinitrate