Cytosinium hydrogen selenite

In the crystal structure of the title salt, C₄H₆N₃O⁺·HSeO₃⁻, systematic name 6-amino-2-methyl­idene-2,3-di­hydro­pyrim­idin-1-ium hydrogen selenite, the hydrogenselenite anions and the cytosinium cations are linked via N—H...O, N—H...Se, O—H...O, O—H··Se and C—H...O hydrogen bonds, forming a three-dimensional framework.

Di­aqua­bis­(ethyl­enedi­amine-κ²N,N′)copper(II) bis­(sulfamerazinate)

The asymmetric unit of the title compound, [Cu(C₂H₈N₂)₂(H₂O)₂](C₁₁H₁₁N₄O₂S)₂, contains one sulfamerazinate anion in a general position and one half-cation that is located on a center of inversion. The Cu^II cation shows a strong Jahn–Teller distortion. It is coordinated by four N atoms of two ethyl­enedi­amine ligands in the basal plane and two O atoms at much longer distances in the axial positions in a bipyramidal coordination. In the crystal, the building blocks are connected by N—H...N, O—H...N, N—H...O and O—H...O hydrogen bonding into a two-dimensional network parallel to (001).