2-Amino­pyridinium 4-hydroxy­benzoate

In the title compound, C5H7N2 +·C7H5O3 −, the carboxyl­ate mean plane of the 4-hydroxy­benzoate anion is twisted by 8.78 (5)° from the attached ring. The cations and anions are linked via O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, forming a three-dimensional network. In addition, π–π inter­actions involving the benzene and pyridinium rings, with centroid–centroid distances of 3.5500 (6) and 3.6594 (6) Å, are observed

A second monoclinic polymorph of methyl 4-hydroxy­benzoate

A second monoclinic polymorph of methyl 4-hydroxy­benzoate, C8H8O3, is reported. The unit-cell dimensions are different from those of the previously reported monoclinic form [Vujovic & Nassimbeni (2006 ▶). Cryst. Growth Des. 6, 1595–1597]. The asymmetric unit contains three crystallographically independent mol­ecules, as observed in the previous form. The crystal structure is stabilized by inter­molecular O—H⋯O and C—H⋯O hydrogen bonds and C—H⋯π inter­actions, which link the mol­ecules into a three-dimensional network

Bis(2-amino­pyridine-κN 1)silver(I) nitrate

The asymmetric unit of the title compound, [Ag(C5H6N2)2]NO3, consists of one and a half each of both cations and anions, the other halves being generated by crystallographic inversion centres. One of the AgI atoms lies on an inversion center and one of the nitrate ions is disordered across an inversion center. Each AgI atom is bicoordinated in a linear geometry by two N atoms from two 2-amino­pyridine ligands. In the crystal structure, the cations and anions are linked into a two-dimensional network parallel to (001) by N—H⋯O and C—H⋯O hydrogen bonds

4-[(E)-4-Methoxy­benzyl­ideneamino]-3-{1-[4-(2-methyl­prop­yl)phen­yl]eth­yl}-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C22H26N4OS, the benzene rings of the (2-methyl­prop­yl)phenyl and 4-methoxy­phenyl units form dihedral angles of 66.85 (3) and 25.96 (3)°, respectively, with the triazole ring. The dihedral angle between the two benzene rings is 87.42 (2)°. The –CH(CH3) linkage is disordered over two orientations with occupancies of 0.907 (3) and 0.093 (3). An intra­molecular C—H⋯S hydrogen bond generates an S(6) ring motif. Inter­molecular N—H⋯S hydrogen bonds and C—H⋯π inter­actions are observed

3-[1-(4-Isobutyl­phen­yl)eth­yl]-4-[(E)-4-methyl­benzyl­ideneamino]-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C22H26N4S, the dihedral angles formed by the triazole ring with the two benzene rings are 87.51 (3) and 20.98 (3)°. The benzene rings are inclined at 71.88 (2)°. An intra­molecular C—H⋯S hydrogen bond generates an S(6) ring motif. The crystal packing is strengthened by inter­molecular N—H⋯S hydrogen bonding and π–π stacking inter­actions between the triazole and benzene rings, with a centroid–centroid distance of 3.6618 (5) Å, together with N⋯N [2.1299 (9)–2.2121 (9) Å] short contacts and C—H⋯π inter­actions. In the crystal packing, mol­ecules are stacked along the a axis

4-(Dimethyl­amino)phenyl phenyl ketone

In the crystal structure of the title compound, C15H15NO, the two benzene rings are twisted from each other by a dihedral angle of 47.97 (4)°. The crystal structure is stabilized by weak inter­molecular C—H⋯O and C—H⋯π inter­actions, and π–π inter­actions with a centroid–centroid distance of 3.8493 (5) Å are observed

2-(7-Hydr­oxy-2-naphth­yloxy)-N-(6-methyl-2-pyrid­yl)acetamide

In the title compound, C18H16N2O3, the dihedral angle between the naphthalene ring system and the pyridyl ring is 18.1 (8)°. The mol­ecules are inter­connected via C—H⋯O and O—H⋯O hydrogen bonds. Inversion-related mol­ecules are linked by O—H⋯O hydrogen bonds into cyclic centrosymmetric R 2 2(22) dimers. Intra­molecular N—H⋯O hydrogen bonding produces an S(5) ring motif. The crystal structure is further stabilized by weak C—H—π inter­actions

(E)-3-(2-Chloro­phen­yl)-1-(3-methoxy­phen­yl)prop-2-en-1-one

The title compound, C16H13ClO2, adopts an E configuration with respect to the double bond of the propenone unit. The two benzene rings are twisted slightly from each other, making a dihedral angle of 7.14 (5)°. The mol­ecules are arranged in stacks, in which adjacent mol­ecules are related by inversion symmetry and form π–π inter­actions with a centroid–centroid distance of 3.7098 (6) Å. C—H⋯O and C—H⋯π inter­actions are formed between neighbouring mol­ecules