2-(2-Hydroxybenzylidene)-1-(2-picoloyl)hydrazine Hemihydrate

The crystal structure of (E)-4-chloro-2-(((5-methylpyridin-2-yl)imino)methyl)phenol, C13H11ClN2O

C13H11ClN2O, monoclinic, P21/n (no. 14), a = 13.997(5) Å, b = 4.6734(15) Å, c = 18.019(7) Å, β = 102.714(5)°, V = 1149.7(7) Å3, Z = 4, R gt(F) = 0.0481, wR ref(F 2) = 0.1141, T = 153(2) K.

Bis[2-(benzyl-idene-amino)-phen-yl] disulfide

In the title mol­ecule, C₂₆H₂₀N₂S₂, the two benzene rings connected by a disulfide chain form a dihedral angle of 84.9 (1)°, and the two benzene rings in the two benzyl­idene­amino­phenyl fragments form dihedral angles of 34.4 (1) and 32.8 (1)°. The crystal structure exhibits weak inter­molecular C—H⋯S hydrogen bonds, which link the mol­ecules into chains along [101].

Methyl 2-methyl-2H-1,2,3-triazole-4-carboxyl-ate

In the title compound, C(5)H(7)N(3)O(2), all non-H atoms lie in a common plane, with a maximum deviation of 0.061 (2)° for the ester methyl C atom. The structure is stabilized by inter-molecular C-H⋯O hydrogen bonds.

Methyl 1H-1,2,3-triazole-4-carboxylate

The title compound, C₄H₅N₃O₂, features an essentially planar mol­ecule (r.m.s. deviation for all non-H atoms = 0.013 Å). The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds and π–π stacking inter­actions (centroid–centroid distance 3.882 Å).

Ethyl 1-(6-chloro-3-pyridylmethyl)-5-ethoxymethyleneamino-1H-1,2,3-triazole-4-carboxylate

In the title compound, C₁₄H₁₆ClN₅O₃, there is evidence for significant electron delocalization in the triazolyl system. Intra­molecular C—H⋯O and inter­molecular C—H⋯O and C—H⋯N hydrogen bonds stabilize the structure.

Ethyl 1-(6-chloro-3-pyridylmethyl)-5-methyl-1H-1,2,3-triazole-4-carboxylate

In the title compound, C₁₂H₁₃ClN₄O₂, the triazole ring carries methyl and ethoxy­carbonyl groups, and is bound via a methyl­ene bridge to a chloro­pyridine unit. There is evidence for significant electron delocalization in the triazolyl system. Intra­molecular C—H⋯O and inter­molecular C—H⋯N hydrogen bonds stabilize the structure.

Ethyl 1-[(2-chloro-1,3-thia-zol-5-yl)methyl]-5-methyl-1H-1,2,3-triazole-4-carboxylate

In the title compound, C(10)H(11)ClN(4)O(2)S, the triazole ring carries methyl and ethoxy-carbonyl groups and is bound via a methyl-ene bridge to a chloro-thia-zole unit. There is also evidence for significant electron delocalization in the triazolyl system. Intra- and inter-molecular C-H⋯O hydrogen bonds together with strong π-π stacking inter-actions [centroid-centroid distance 3.620 (1) Å] stabilize the structure.

Bis{4-[(Z)-N'-(4-hydroxy-benzyl-idene)hydrazino]-8-(trifluoro-meth-yl)quinolinium} sulfate dihydrate

The title compound, 2C₁₇H₁₃F₃N₃O⁺·SO₄²⁻·2H₂O, crystallizes with four independent cations (A, B, C and D) in the asymmetric unit, which is composed of two groups of two cations, one anion and two water mol­ecules (Z′ = 2). The dihedral angle between the mean planes of the 4-hydroxy­phenyl and quinolinium groups is 8.9 (7)° in A, 30.1 (6)° in B, 28.8 (8)° in C and 12.8 (1)° in D. The crystal packing is stabilized by inter­molecular O—H⋯O and N—H⋯O hydrogen bonding between H atoms from 4-hydroxy­phenyl O atoms and the O atoms of nearby water molecules and sulfate anions, as well as H atoms from the N atom of the hydrazino group to O atoms of neighboring sulfate anions, linking the components into chains with the 4-hydroxy­phenyl and quinolinium rings parallel to the (011) plane. There is also an extensive array of inter­molecular hydrogen bonds between water mol­ecules themselves and with sulfate O atoms, as well as hydrogen-bond inter­actions between H atoms from the hydrazino group and sulfate O atoms. In addition, inter­molecular π–π stacking inter­actions occur between nearby 4-hydroxy­phenyl and quinolinium groups, with distances between the centroids of inter­acting rings in the range 3.4140 (9)–3.9659 (9) Å.

2-(4-Amino-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-ylmeth-yl)isoindoline-1,3-dione

The title compound, C₁₁H₉N₅O₂S, was synthesized from N-phthaloylglycine and thio­carbohydrazide by the fusion method. This is the first report of a triazole derivative of N-phthaloylglycine. The title compound exists in the thione form. The mol­ecule is non-planar, with a dihedral angle between the isoindoline ring system and the triazole ring system of 82.24 (5)°. The crystal structure is stabilized by inter­molecular hydrogen bonding linking the mol­ecules into a three-dimensional network.