(3-Amino­phen­yl)methanol

In the title compound, C7H9NO, a derivative of benzyl alcohol, the endocyclic C—C—C angles are in the range 119.50 (12)–121.04 (12)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen-bond inter­actions, forming an extended two-dimensional framework parallel to ab. O—H⋯N inter­actions are also observed

Pyridine-2,3-diamine

The mol­ecule of the title pyridine derivative, C5H7N3, shows approximately non-crystallographic C s symmetry. Intra­cyclic angles cover the range 117.50 (14)–123.03 (15)°. In the crystal, N—H⋯N hydrogen bonds connect mol­ecules into a three-dimensional network. The closest inter­centroid distance between two π-systems occurs with the c-axis repeat at 3.9064 (12) Å

4-((E)-{2-[N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)carboximido­yl]benzyl­idene}amino)-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one

The title compound, C30H28N6O2, is a symmetric diimine derived from ortho-dibenzaldehyde. Both C=N bonds are (E)-configured. The terminal N-bonded phenyl groups adopt staggered conformations relative to their respective parent heterocycles, the relevant least-squares planes inter­sect at angles of 32.35 (11) and 38.59 (10)°. In the crystal, C—H⋯O contacts connect the mol­ecules into chains along the b axis and give rise to a C 1 1(14)C 1 1(14) and a R 2 2(12) pattern on different levels of graph-set analysis. The shortest inter­centroid distance between two centroids was found at 4.2074 (11) Å between the two five-membered heterocycles

Redetermined structure of diphenyl­phospho­nimidotriphenyl­phospho­rane: location of the hydrogen atoms and analysis of the inter­molecular inter­actions

The title compound, C30H25NOP2, is a bulky phosphazene derivative. Its previous crystal structure [Cameron et al. (1979 ▶). Acta Cryst. B35, 1373–1377] is confirmed and its H atoms have been located in the present study. The formal P=N double bond is about 0.05 Å shorter than the P—N single bond and the large P=N—P bond angle reflects the steric strain in the mol­ecule. An intra­molecular C—H⋯O inter­action occurs. In the crystal, short C—H⋯O contacts connect the mol­ecules into chains propagating in [011], which are cross-linked via C—H⋯π inter­actions, generating a three-dimensional network. Aromatic π–π stacking also occurs [shortest centroid–centroid separation = 3.6012 (11) Å]

A monoclinic polymorph of (1E,5E)-1,5-bis­(2-hy­droxy­benzyl­idene)thio­carbono­hydrazide

The title compound, C15H14N4O2S, is a derivative of thio­ureadihydrazide. In contrast to the previously reported polymorph (ortho­rhom­bic, space group Pbca, Z = 8), the current study revealed monoclinic symmetry (space group P21/n, Z = 4). The mol­ecule shows non-crystallographic C 2 as well as approximate C s symmetry. Intra­molecular bifurcated O—H⋯(N,S) hydrogen bonds, are present. In the crystal, inter­molecular N—H⋯S hydrogen bonds and C—H⋯π contacts connect the mol­ecules into undulating chains along the b axis. The shortest centroid–centroid distance between two aromatic systems is 4.5285 (12) Å

2-Hy­droxy-N-(2-hy­droxy­eth­yl)benzamide

In the title compound, C9H11NO3, a derivative of salicyl­amide, the intra­cyclic C—C—C angles span the range 117.96 (13)–121.56 (14)°. An intra­molecular O—H⋯O hydro­gen bond occurs. In the crystal, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds occur and C—H⋯O contacts connect the mol­ecules into a three-dimensional network. The closest inter­centroid distance between two π-systems is 3.8809 (10) Å

N,N′-Bis[(E)-2,4,6-trimethyl­benzyl­idene]ethane-1,2-diamine

The title compound, C22H28N2, which is a double imine derived from ethane-1,2-diamine and mesityl aldehyde, has crystallographic inversion symmetry, with both C=N bonds E configured. The dihedral angle between the mesityl ring system and the imide functional group is 23.89 (17)°

(2-Hy­droxy-4-meth­oxy­phen­yl)(2-hy­droxy­phen­yl)methanone

The title compound, C14H12O4, is an asymmetric substitution product of benzophenone. Both hy­droxy groups are orientated towards the O atom of the keto group. Intra­molecular as well as inter­molecular O—H⋯O hydrogen bonds can be observed in the crystal structure, with the latter connecting the mol­ecules into chains along the crystallographic b axis. C—H⋯O contacts [C⋯O = 3.3297 (18) Å] are also apparent. The closest centroid–centroid distance between two aromatic systems is 4.9186 (9) Å

6-(2-Hydroxy­phen­yl)-5,6-dihydro­benzimidazolo[1,2-c]quinazolin-12-ium bromide ethanol solvate

In the title compound, C20H16N3O+·Br−·C2H6O, the phenol ring forms dihedral angles of 84.5 (1) and 89.3 (1)° with the benzimidazole system and the quinazoline benzene ring, respectively. The two N—H groups act as donors in hydrogen bonds with the bromide ion as acceptor, leading to infinite eight-membered chains along [100]. According to graph-set theory the descriptor on the binary level is C 2 1(8). O—H⋯O and O—H⋯Br hydrogen bonds also occur

3-Methyl-1-phenyl-4-[(phen­yl)(2-phenyl­hydrazin-1-yl)meth­ylidene]-1H-pyrazol-5(4H)-one

The title compound, C23H20N4O, is a heterocyclic phenyl­hydrazone Schiff base with a pyrazole moiety. In the crystal, a variety of inter­actions occur, including N—H⋯π and π–π stacking between the phenyl ring of the phenyl­hydrazinyl group and its symmetry-generated equivalent [centroid–centroid distance = 3.6512 (7) Å]