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A tetranuclear complex with an open-cubane-like core structure was synthesized from 2-methoxy-6-(pyridin-2-yl-hydrazonomethyl)phenol ( HL ), namely,  cyclo -tetrakis(μ-2-methoxy-6-{[2-(pyridin-2-yl)hydrazin-1-ylidene]methyl}phenolato)tetranickel(II) tetrakis(perchlorate) acetonitrile monosolvate dihydrate, [Ni 4 (C 13 H 12 N 3 O 2 ) 4 ](ClO 4 ) 4 ·C 2 H 3 N·2H 2 O, and characterized using micro-analytical and spectroscopic techniques. The crystal-structure determination reveals the formation of a distorted Ni 4 O 4  cubane-like core architecture encapsulated by four hydrazone Schiff base ( HL ) molecules. A open-cube tetranuclear architecture is created in which nickel(II) ions of the NiN 2 O 3  unit are connected by μ 2 -O anions of the phenolate moiety of  HL . In this complex, each Ni centre has a slightly distorted square-pyramidal coordination environment. The supramolecular architectures are stabilized  via  the presence of various intermolecular hydrogen bonds and (aryl–aryl, aryl–chelate and chelate–chelate) stacking interactions.

acta crystallographica. section e, crystallographic communications

A tetranuclear nickel(II) complex, [Ni4(L)4](ClO4)4·C2H3N·2H2O, with an asymmetric Ni4O4 open-cubane-like core