N-p-Tolyladamantane-1-carboxamide

In the crystal of the title compound, C18H23NO, the mol­ecules are linked into chains along the c axis by inter­molecular N—H⋯O hydrogen bonds

N-Butyladamantane-1-carboxamide

In the crystal of the title compound, C15H25NO, the mol­ecules are linked into chains propagating in [001] by inter­molecular N—H⋯O hydrogen bonds

4-[(2′-Cyano­biphenyl-4-yl)methyl]­morpholin-4-ium nitrate

The title ion pair, C18H19N2O+·NO3 −, features an N—H⋯O hydrogen bond linking the cation to the anion. The morpholine portion adopts a chair conformation; the aromatic rings of the biphenyl­ene portion are twisted [torsion angles for the four atoms involving the ar­yl–aryl bond = 35.1 (2)–40.4 (2)°]

4′-(Morpholino­meth­yl)biphenyl-2-carbonitrile

In the title compound, C18H18N2O, the morpholine ring adopts a chair conformation and the dihedral angle between the aromatic rings is 49.16 (7)°. In the crystal, weak C—H⋯π inter­actions may help to establish the packing

1,4-Diazo­niabicyclo­[2.2.2]octane bis­(2,4,6-trinitro­phenolate)

In the title compound, C6H14N2 2+·2C6H2N3O7 −, the cation possesses crystallographically imposed twofold rotation symmetry. In the crystal structure, the cation and anions are linked into a trimeric aggregate by inter­molecular N—H⋯O hydrogen bonds. The trimeric units are further connected by π–π inter­actions [centroid–centroid distances = 3.507 (2)–3.660 (3) Å], forming layers parallel to the bc plane

4-Iodo­anilinium perchlorate

In the crystal structure of the title compound, C6H7IN+·ClO4 −, the ions are connected in a three-dimensional hydrogen-bonded network via N—H⋯O hydrogen bonds