Tetra­aqua­bis[μ-N-(5-nitro-2-oxido­benzyl­idene)glycylglycinato]manganese(II)dinickel(II) tetra­hydrate

The two unique Ni(II) atoms of the title complex, [MnNi(2)(C(11)H(8)N(3)O(6))(2)(H(2)O)(4)]·4H(2)O, have a slightly distorted square-planar coordination environment with a tetra­dentate N-(5-nitro-2-oxidobenzyl­idene)glycylglycinate Schiff base trianion. The Ni(II) atoms are coordinated by one phenolate O atom, one imine N atom, one amido N atom and one carboxyl­ate O atom. The Mn(II )atom is connected via the carboxyl­ate groups, forming a hetero-trinuclear Ni(II)–Mn(II)–Ni(II) system. The Mn(II) atom is six-coordinated in an octa­hedral geometry by four O atoms from two carboxyl­ate groups and four water mol­ecules. The Ni(II)–Mn(II)–Ni(II) hetero-trinuclear mol­ecules are stacked in the crystal and cross-linked through O—H⋯O hydrogen bonds.