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The title complex, [Ni(C3H2O4)(C12H8N2)(H2O)2]·3H2O, displays a distorted octa­hedral NiN2O4 coordination geometry, formed by a malonate dianion, a 1,10-phenanthroline ligand and two trans water mol­ecules. The Ni atom and one O atom, the latter from a solvent water mol­ecule, are located on twofold axes of symmetry. The crystal structure is stabilized by extensive O—H⋯O hydrogen-bonding inter­actions. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title cadmium(II) complex, [Cd2(C7H3NO4)2(C10H8N2)2(H2O)2]·2H2O, the pyridine-2,5-dicarboxyl­ate (pydc) dianions bridge the CdII ions to form a centrosymmetric dimeric complex. Each CdII ion has a distorted octa­hedral coordination geometry. [ABSTRACT FROM AUTHOR]

In the title compound, C24H34O8, a strong intra­molecular O—H⋯O hydrogen bond is formed between the OH substituent of salicyaldehyde and the aldehyde O atom. [ABSTRACT FROM AUTHOR]