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5,6-Dioxo-1,10-phenanthroline-2,9-dicarb­oxy­lic acid dihydrate (H2pdda·2H2O), C14H6N2O6·2H2O, was obtained by car­bonyl­ation of 1,10-phenanthroline-2,9-dicarb­oxy­lic acid. Its first coordination compound, [MnCl(C14H6N2O6)(H2O)2]Cl·2H2O, in which the H2pdda ligand remains protonated, was synthesized in aqueous acetic acid. H2pdda chelates one water mol­ecule via hydrogen bonds in H2pdda·2H2O, whereas in the coordination compound it chelates one hepta­coordinate MnII atom via coordination bonds. The N atoms in H2pdda·2H2O and the Cl atoms in the coordination compound are also involved in hydrogen bonds. Extensive hydrogen bonding results in supra­molecular networks in both com­pounds.
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