N-(Diphenyl­carbamo­yl)-N,N',N',N'',N''-penta­methyl­guanidinium tetra­phenyl­borate

In the title salt, C₁₉H₂₅N₄O⁺·C₂₄H₂₀B^-, the C=N and C-N bond lengths in the CN₃ unit are 1.3327 (8)/1.3364 (9) and 1.3802 (9) Å, indicating double- and single-bond character, respectively. The N-C-N angles are 118.77 (6), 120.29 (6) and 120.81 (6)°, showing only a small deviation of the CN₃ plane from an ideal trigonal-planar geometry. The bonds between the N atoms and the terminal methyl C atoms all have values close to a typical single bond [1.4636 (9)-1.4772 (9) Å]. The crystal packing is caused by electrostatic inter­actions between cations and anions.

N,N,N′,N′,N′′-Penta­methyl-N′′-[3-(tri­methyl­aza­nium­yl)prop­yl]guanidinium bis­(tetra­phenyl­borate)

In the crystal structure of the title salt, C₁₂H₃₀N₄²⁺·2C₂₄H₂₀B⁻, the C—N bond lengths in the central CN₃ unit of the guanidinium ion are 1.3388 (17), 1.3390 (16) and 1.3540 (17) Å, indicating partial double-bond character in each. 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 bonds between the N atoms and the terminal C-methyl groups of the guanidinium moiety, all have values close to a typical single bond [1.4630 (16)–1.4697 (17) Å]. C—H...π inter­actions are present between the guanidinium H atoms and the phenyl C atoms of one tetra­phenyl­borate ion. The phenyl rings form a kind of aromatic pocket, in which the guanidinium ion is embedded.

N,N,N′,N′-Tetra­methyl-N′′-[3-(trimethyl­aza­nium­yl)prop­yl]guanidinium bis­(tetra­phenyl­borate) acetone disolvate

In the title solvated salt, C₁₁H₂₈N₄²⁺·2C₂₄H₂₀B⁻·2C₃H₆O, the C—N bond lengths in the central CN₃ unit of the guanidinium ion are 1.3331 (16), 1.3407 (16) and 1.3454 (16) Å, indicating partial double-bond character in each. The central C atom is bonded to the three N atoms in a nearly ideal trigonal–planar geometry [N—C—N angles = 118.96 (11), 120.51 (12) and 120.53 (11)°] and the positive charge is delocalized in the CN₃ plane. The bonds between the N atoms and the terminal C-methyl groups of the guanidinium moiety all have values close to a typical single bond [1.4601 (16)–1.4649 (16) Å]. In the crystal, the guanidinium ion is connected by N—H...O and C—H...O hydrogen bonds with the acetone mol­ecules. C—H...π inter­actions are present between the guanidinium H atoms and the phenyl rings of both tetra­phenyl­borate ions. The phenyl rings form aromatic pockets, in which the guanidinium ions are embedded.

N-[3-(Benzyl­dimethyl­aza­nium­yl)prop­yl]-N′,N′,N′′,N′′-tetra­methyl­guanidinium bis­(tetra­phenyl­borate)

In the crystal structure of the title salt, C₁₇H₃₂N₄²⁺·2C₂₄H₂₀B⁻, the C—N bond lengths in the CN₃ unit of the guanidinium ion are 1.323 (4), 1.336 (5) and 1.337 (5) Å, indicating partial double-bond character in each. The C atom of this unit is bonded to the three N atoms in a nearly ideal trigonal–planar geometry [N—C—N angles = 117.7 (4), 120.9 (3) and 121.4 (3)°] and the positive charge is delocalized in the CN₃ plane. The bonds between the N atoms and the terminal C-methyl groups of the guanidinium moiety all have values close to a typical single bond [1.452 (5)–1.484 (6) Å]. In the crystal, C—H...π inter­actions are present between guanidinium H atoms and the phenyl rings of both tetra­phenyl­borate ions. This leads to the formation of a two-dimensional supramolecular pattern along the ab plane.

N-[3-(Di­methyl­amino)­prop­yl]-N,N′,N′,N′′,N′′-penta­methyl­guanidinium tetra­phenyl­borate

In the title salt, C₁₁H₂₇N₄⁺·C₂₄H₂₀B⁻, the C—N bond lengths in the central CN₃ unit of the guanidinium ion are 1.333 (4), 1.334 (4) and 1.351 (4) Å, indicating partial double-bond character. The C atom of this unit is bonded to the three N atoms in a nearly ideal trigonal-planar geometry [N—C—N angles = 118.8 (3), 120.0 (3) and 121.2 (3)°] and the positive charge is delocalized in the CN₃ plane. The bonds between the N atoms and the terminal C-methyl groups of the guanidinium moiety have values in the range 1.459 (4)–1.478 (4) Å, close to a typical single bond. In the crystal, there are C—H...π inter­actions between the guanidinium H atoms and the phenyl rings of the tetra­phenyl­borate ion. These inter­actions combine to form a ladder of linked chains of ions which runs parallel to the c axis.

2-[4-(Carbazol-9-yl)phen­yl]-1,3-diethyl-1,3-di­phenyl­guanidine

In the title compound, C₃₅H₃₂N₄, the C—N bond lengths in the guanidine part are 1.286 (3), 1.387 (2) and 1.414 (2) Å, indicating double- and single-bond character. The N—C—N angles are 114.48 (17), 118.78 (17) and 126.72 (17)°, showing a deviation of the CN₃ plane from an ideal trigonal–planar geometry. The carbazole ring system is almost planar (r.m.s. deviation = 0.002 Å). In the crystal, mol­ecules are connected by weak C—H...N hydrogen bonds, generating a zigzag chain along the ac plane. Weak π–π inter­actions [centroid–centroid distance = 3.785 (1) Å] between two phenyl rings of the guanidine moiety are also present.