1,1-Dimethyl­biguanidium(2+) dinitrate

In the crystal structure of the title compound, C4H13N5 2+·2NO3 −, the main inter­molecular inter­actions are the N—H⋯O hydrogen bonds between the cationic amino groups and the O atoms of the nitrate ions. All amino H atoms and nitrate O atoms are involved in the three-dimensional hydrogen-bond network. There are two graph-set motifs R 2 2(8), which include the amino groups connected to the N atoms in the biguanide 3-, 4- and 5-positions, and the O atoms of a nitrate ion. They are extended along the a axis. An O atom of the second nitrate ion is involved in a graph-set motif C(4) that is a part of a helix-like N—H⋯O⋯H—N—H⋯O⋯ chain oriented along the b axis. There are also two weak C—H⋯O inter­actions in the crystal structure

Bis(hydrogen l-glutamato)palladium(II)

In the title compound, [Pd(C5H8NO4)2], the Pd(II) atom is coordinated by two O atoms and two N atoms of two N,O-chelating hydrogen l-glutatmate ligands in a square–planar geometry with the N and O atoms in a mutually trans arrangement. The complex units are embedded in a network of N—H⋯O and O—H⋯O hydrogen-bonding inter­actions that stabilize the three-dimensional crystal structure. The strongest hydrogen bonds are formed between the γ-COOH untis of adjacent glutamate ligands, leading to dimers of the type R 2 2(8) with O⋯O separations of 2.640 (6) Å