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In the title methanol disolvate complex, [Ni 4 (C 14 H 16 N 3 O 4 ) 2 (ClO 4 ) 2 (C 10 H 8 N 2 ) 2 ]·2CH 3 OH, the neutral tetra­nickel(II) system lies on a centre of inversion. The polyhedron around each Ni(II) atom is a square pyramid. The separations of the Ni atoms bridged by the oxamide and carboxyl groups are 5.227 (9) and 5.268 (6) Å, respectively. In the crystal structure, a two-dimensional supramolecular network structure involving O—H⋯O and C—H⋯O hydrogen bonding is observed.

acta crystallographica. section e

Bis(2,2′-bipyridine)bis{μ3-cis-N-(2-carboxylatophenyl)-N′-[3-(dimethylamino)propyl]oxamidato(3−)}bis(perchlorato)tetranickel(II) methanol disolvate