Two new metal coordination polymers containing mixed ligands:: hydrothermal synthesis and crystal structures of [Co2(1,2,4,5-btc)(phen)2(H2O)6] • 2H2O and [Mn3(1,2,4-btc)2(phen)2(H2O)2]n

Crystallisation of benzene-1,2,4,5-tetracarboxylic acid or benzene-1,2,4-tricarboxylic acid with divalent metal ions of Co, and Mn with 1,10-phenanthroline gives two new coordination solids, [Co-2(C10H2O8)(C12H8N2)(2)(H2O)(6)] center dot 2H(2)O (1) and [Mn-3(C9H3O6)(2)(C12H8N2)(2)(H2O)(2)](n) ( 2). The three-dimensional supramolecular structure of compound 1 is constructed from discrete [Co-2(C10H2O8)(C12H8N2)(2)(OH2)(6)] dimers and isolated water molecules via interesting hydrogen-bonding and pi-pi stacking interactions. Compound 2 has an unusual ( 4, 6) network, and the network is furthermore extended into a three-dimensional supramolecular architecture by the aid of hydrogen bonding and pi-pi stacking interactions.