title: Synthesis and supramolecular networks of 5,6-dioxo-1,10-phenanthroline-2,9-dicarboxylic acid dihydrate and its first coordination compound cis-diaquachlorido(5,6-dioxo-1,10-phenanthroline-2,9-dicarboxylic acid-κ4O2,N,N',O9)manganese(II) chloride dihydrate.
abstract: 5,6-Dioxo-1,10-phenanthroline-2,9-dicarboxylic acid dihydrate (H(2)pdda·2H(2)O), C(14)H(6)N(2)O(6)·2H(2)O, was obtained by carbonylation of 1,10-phenanthroline-2,9-dicarboxylic acid. Its first coordination compound, [MnCl(C(14)H(6)N(2)O(6))(H(2)O)(2)]Cl·2H(2)O, in which the H(2)pdda ligand remains protonated, was synthesized in aqueous acetic acid. H(2)pdda chelates one water molecule via hydrogen bonds in H(2)pdda·2H(2)O, whereas in the coordination compound it chelates one heptacoordinate Mn(II) atom via coordination bonds. The N atoms in H(2)pdda·2H(2)O and the Cl atoms in the coordination compound are also involved in hydrogen bonds. Extensive hydrogen bonding results in supramolecular networks in both compounds.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Jin
authors.forename: Mei-Feng
authors.initials: MF
authors.lastname: Wen
authors.forename: Lu-Fang
authors.initials: LF
authors.lastname: Liu
authors.forename: Ming-Juan
authors.initials: MJ
authors.lastname: Gao
authors.forename: Jian-Zhong
authors.initials: JZ
authors.lastname: Wu