Hong Su

Bis(melaminium) tartrate dihydrate.

In the title compound, 2C3H7N6 +·C4H4O6 2−·2H2O, in which the complete anion is generated by crystallographic twofold symmetry, there are O—H⋯O, N—H⋯O and N—H⋯N hydrogen-bonding interactions between neighbouring moieties, forming layers parallel to the bc plane. In addition, π–π contacts [centroid–centroid distance = 3.6541u2005(9)u2005Å] between the six-membered rings of the melamine cations are observed.

Hexaaquacadmium(II) bis{[1-(4-hydroxyphenyl)-1H-tetrazol-5-ylsulfanyl]acetate}

In the title complex, [Cd(H2O)6](C9H7N4O3S)2, the metal center is six-coordinate, forming an ideal centrosymmetric octaxadhedral geometry. A three-dimensional supraxadmolecular architecture is formed through hydrogen-bonding (O—H⋯O) and offset π–π stacking interxadactions (distance between pairs of adjacent benzene rings = 3.532u2005A and centroid-to-centroid separation = 3.672u2005A).