Piperidine-1-carboxamidinium ethyl carbonate

In the title salt, C₆H₁₄N₃⁺·C₃H₅O₃⁻, the C—N bond lengths in the central CN₃ unit of the carboxamidinium cation are 1.3262 (18), 1.3359 (18) and 1.3498 (18) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charge is delocalized in the CN₃ plane. The piperidine ring is in a chair conformation. The C—O bond lengths in the ethyl carbonate anion are characteristic for a delocalized double bond and a typical single bond. In the crystal, N—H...O hydrogen bonds between cations and anions generate a two-dimensional network in the direction of the ab plane, whereas adjacent ion pairs form chains running along the b axis.

Morpholine-4-carboxamidinium ethyl carbonate

The asymmetric unit of the title salt, C₅H₁₂N₃O⁺·C₃H₅O₃⁻, contains two carboxamidinium and two ethyl carbonate ions. In the crystal, the C—N bond lengths in the central CN₃ units of the cations range between 1.324 (2) and 1.352 (2) Å, indicating partial double-bond character. The central C atoms are bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charges are delocalized in the CN₃ planes. The morpholine rings are in chair conformations. The C—O bond lengths in both ethyl carbonate ions are characteristic for delocalized double bonds [1.243 (2)–1.251 (2) Å] and typical single bonds [1.368 (2) and 1.375 (2) Å]. In the crystal, N—H...O hydrogen bonds between cations and anions generate a two-dimensional network in the ac plane.

N,N,N',N'-Tetra­methyl­guanidinium tetra­phenyl­borate

In the title salt, C₅H₁₄N₃⁺·C₂₄H₂₀B^-, the C-N bond lengths in the central CN₃ unit are 1.3322 (11), 1.3385 (12) and 1.3422 (12) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms in a nearly ideal trigonal-planar geometry [N-C-N angles = 119.51 (8), 119.81 (9) and 120.69 (8)°] and the positive charge is delocalized in the CN₃ plane. The bond lengths between the N atoms and the terminal methyl groups all have values close to a typical single bond [1.4597 (12)-1.4695 (13) Å]. The crystal packing is caused by electrostatic inter­actions between cations and anions.