Diaqua-(5-carb-oxy-benzene-1,3-dicarboxyl-ato-κO(1))[8-ethyl-5-oxo-2-(piperazin-4-ium-1-yl)-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxyl-ato-κ(2)O(5),O(6)]zinc monohydrate.

In the title compound, [Zn(C(14)H(17)N(5)O(3))(C(9)H(4)O(6))(H(2)O)(2)]·H(2)O, the complex mol-ecule exists in a zwitterionic form. The Zn(II) ion exhibits a distorted tetra-gonal-pyramidal geometry, being coordinated by two O atoms from the zwitterionic 8-ethyl-5-oxo-2-(piperazin-4-ium-1-yl)-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxyl-ate (L) ligand, one O atom from the 5-carb-oxy-benzene-1,3-dicarboxyl-ate dianion, [Hbtc](2-), and two O atoms from two aqua ligands. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds link the components into a three-dimensional structure.

cis-Tetra-aqua-bis-{5-[4-(1H-imidazol-1-yl-κN(3))phen-yl]tetra-zolido}manganese(II) dihydrate.

In the title compound, [Mn(C(10)H(7)N(6))(2)(H(2)O)(4)]·2H(2)O, the complex unit comprises an Mn(2+) ion, coordinated by two imidazole N atoms from cis-related monodentate 5-[4-(imidazol-1-yl)phen-yl]tetra-zolide ligands and four water mol-ecules, together with two water mol-ecules of solvation. The Mn(2+) ion lies on a twofold rotation axis and has a slightly distorted octa-hedral geometry. The mol-ecules are connected by O-H⋯N and O-H⋯O hydrogen bonds involving both coordinated and solvent water mol-ecules, generating a three-dimensional structure.

catena-Poly[[(2,2'-bipyridine)-manganese(II)]-μ(3)-4,4'-sulfonyl-dibenzoato].

In the title compound, [Mn(C(14)H(8)O(6)S)(C(10)H(8)N(2))](n), the Mn(II) ion is coordinated by four O atoms from three 4,4'-sulfonyl-dibenzoate (sdba) ligands and two N atoms from one 2,2'-bipyridine (2,2'-bipy) ligand in a distorted octa-hedral geometry. The manganese atoms are alternately bridged either by two sdba ligands, with an Mn⋯Mn separation of 12.284 (1) Å, or by two carboxyl-ate groups from two sdba ligands, with an Mn⋯Mn separation of 4.