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The title compound, (C4H12N)[UO2(NO3)(SeO3)], consists of uranyl complex anions and [NMe4]+ cations. Both cations and anions display mirror symmetry. Each UO2 unit is coordinated by three selenite dianions and one nitrate anion with a penta­gonal–bipyramidal geometry, forming anionic ladder-like chains with charge-compensating [NMe4]+ cations inter­calated between the chains. [ABSTRACT FROM AUTHOR]

Colourless crystals of the title compound, C2H10N22+·2C10H5O8−·2H2O, were isolated from an aqueous solution. The basic structural unit consists of two trihydrogen 1,2,4,5-benzene­tetra­carboxyl­ate (H3btec−) anions, an ethyl­enediammonium cation and two solvent water mol­ecules. The ethyl­enediammonium cation is centrosymmetric. The anion has a short intra­molecular hydrogen bond of 2.427 (4) Å involving a deprotonated carboxyl­ate group as acceptor. A three-dimensional hydrogen-bonding network defines the crystal packing, and solvent water mol­ecules and the cations occupy voids in the crystal structure. [ABSTRACT FROM AUTHOR]

In the complex mol­ecule of the title compound, [Zn(C9H5O6)2(H2O)4]·2H2O, zinc(II) is six-coordinated by two O atoms from two monodentate 2,4-dicarboxy­benzoate ligands and four O atoms from water mol­ecules. The complex possesses a crystallographically imposed centre of symmetry. In the crystal packing, complex mol­ecules and water mol­ecules are connected by strong inter­molecular O—H⋯O hydrogen bonds, resulting in an extended three-dimensional network. A zigzag chain of hydrogen-bonded water mol­ecules running along the c axis is observed. [ABSTRACT FROM AUTHOR]

The title complex, (C4H12N2)[Ni2(C6H5O7)2(H2O)4], was synthesized under solvothermal conditions. Both cation and anion possess crystallographically imposed inversion symmetry. The citrate ion acts as a quadridentate ligand, coordinating through the hydroxyl and two carboxylate O atoms to one nickel atom, and bridging the second metal centre through the remaining carboxylate group. The coordination around each NiII atom is completed to distorted octahedral by the O atoms of two water molecules. The crystal structure is stabilized by intra- and intermolecular O—H...O and N—H...O hydrogen-bonding interactions. [ABSTRACT FROM AUTHOR]