4-{[(E)-(3-Phenyl-1H-pyrazol-4-yl)methyl­idene]amino}-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C12H10N6S, a weak intra­molecular C—H⋯S hydrogen bond stabilizes the mol­ecular conformation. The pyrazole and triazole rings form a dihedral angle of 17.82 (8)°. The mol­ecule adopts an E configuration with respect to the central C=N double bond. In the crystal, inter­molecular N—H⋯N and N—H⋯S hydrogen bonds link mol­ecules into chains propagating in [20]

4-(1,2,4-Triazol-1-yl)aniline

In the title compound, C8H8N4, the dihedral angle between the triazole ring [maximum deviation = 0.003 (1) Å] and the benzene ring is 34.57 (7)°. In the crystal, mol­ecules are linked into sheets lying parallel to the ac plane via inter­molecular N—H⋯N and C—H⋯N hydrogen bonds. Aromatic π–π [centroid–centroid distance = 3.6750 (8) Å] stacking and N—H⋯π inter­actions are also observed

(1Z)-1-(2,4-Dichloro­phen­yl)ethan-1-one semicarbazone

In the title compound, C9H9Cl2N3O, the semicarbazone group is approximately planar, with an r.m.s deviation from the mean plane of 0.011 (2) Å. The dihedral angle between the least-squares planes through the semicarbazone group and the benzene ring is 38.76 (9)°. The crystal structure is further stabilized by N—H⋯O and C—H⋯O hydrogen bonding

Synthesis and characterization of Schiff base metal complexes and reactivity studies with maleimide epoxy resin

A novel maleimide epoxy contg. Co(II)​, Ni(II)​, and Cu(II) ions have been synthesized by curing a maleimide epoxy resin (MIEB-​13) with Co(II)​, Ni(II)​, and Cu(II) complexes of a macrocyclic bis-​hydrazone Schiff base. The Schiff base was synthesized by reacting terephthaloyl dihydrazide with 2,​6-​diformyl-​4-​methylphenol. The Schiff base and its Co(II)​, Ni(II)​, and Cu(II) complexes have been characterized by elemental analyses, spectral (IR, 1H NMR, UV-​vis., FAB mass, ESR)​, thermal, and magnetic data. The curing reaction of the epoxy resin was carried out with the metal complex crosslinking agents. The stability of the cured samples was studied by thermogravimetric analyses; the products have excellent chem. (acid​/alkali​/solvent) and water absorption resistance. Further, SEM and DSC techniques confirmed the phase homogeneity of the cured systems

N-(5-Bromo­pyridin-2-yl)acetamide

The asymmetric unit of the title compound, C7H7BrN2O, contains two mol­ecules, in one of which the methyl H atoms are disorderd over two orientations in a 0.57 (3):0.43 (3) ratio. The dihedral angles between the pyridine rings and the acetamide groups are 7.27 (11) and 8.46 (11)°. In the crystal, mol­ecules are linked by N—H⋯O and C—H⋯O hydrogen bonds generating bifurcated R 2 1(5) ring motifs, which in turn lead to [110] chains

(2E)-1-(2,4-Dichloro­phen­yl)-3-[3-(4-nitro­phen­yl)-1-phenyl-1H-pyrazol-4-yl]prop-2-en-1-one

In the title compound, C24H15Cl2N3O3, the C=C double bond is E configured. The 1-phenyl-1H-pyrazole moiety is roughly planar (r.m.s. deviation of all fitted non-H atoms = 0.0780 Å), but the mean planes of the two components are inclined at an angle of 9.95 (7)°. The mean plane defined by the non-H atoms of the 1H-pyrazole ring encloses angles of 9.95 (7), 24.54 (6) and 43.02 (6)° with the mean planes of the different benzene rings. In the crystal, C—H⋯O contacts are present and result in the formation of a double-layer two-dimensional network lying parallel to (110). The shortest inter­centroid distance between two aromatic systems is 3.5455 (7) Å and is apparent between two pyrazole systems. Further π–π inter­actions are manifest between a pair of 4-nitro­phenyl rings [centroid-to-centroid distance = 3.6443 (7) Å] and a pair of 2,4-dichloro­phenyl rings [centroid-to-centroid distance = 3.7797 (7) Å]

Diethyl 4-[5-(4-chloro­phen­yl)-1H-pyrazol-4-yl]-2,6-dimethyl-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

In the title compound, C22H24ClN3O4, intra­molecular C—H⋯O and C—H⋯N hydrogen bonds form S(9) and S(7) ring motifs, respectively. The 1,4-dihydro­pyridine ring adopts a flattened boat conformation. The benzene ring makes a dihedral angle of 33.36 (6)° with the pyrazole ring. In the crystal, pairs of N—H⋯N hydrogen bonds link the mol­ecules into inversion dimers. The dimers are stacked in column along the a axis through N—H⋯O and C—H⋯N hydrogen bonds. The crystal packing also features C—H⋯π inter­actions involving the pyrazole ring

(4-Chloro-2-fluoro­phen­yl)[1-(2,6-difluoro­phen­yl)but-3-en­yl]amine

In the mol­ecule of the title homoallylic amine, C16H13ClF3N, the dihedral angle between the two benzene rings is 84.63 (4)°. Weak intra­molecular N—H⋯F hydrogen bonds generate S(6) and S(5) ring motifs. In the crystal structure, weak inter­molecuar N—H⋯F hydrogen bonds link mol­ecules into centrosymmetric dimers which are arranged in mol­ecular sheets parallel to the ac plane

1-Dibromo­methyl-4-meth­oxy-2-nitro­benzene

The asymmetric unit of the title compound, C8H7Br2NO3, comprises two crystallographically independent mol­ecules (A and B). The nitro groups are twisted from the attached benzene rings, making dihedral angles of 39.26 (9) and 35.90 (9)° in mol­ecules A and B, respectively. In each mol­ecule, the dibromo­methyl group is orientated in such a way that the two Br atoms are tilted away from the benzene ring. An inter­esting features of the crystal structure is the two short Br⋯Br inter­actions which, together with inter­molecular C—H⋯O hydrogen bonds, link the mol­ecules into an extended three-dimensional network. The crystal structure is further stabilized by weak C—H⋯π inter­actions

(E)-1-(2,4-Dichloro­phen­yl)-3-[3-(4-meth­oxy­phen­yl)-1-phenyl-1H-pyrazol-4-yl]prop-2-en-1-one

In the title mol­ecule, C25H18Cl2N2O2, the dihedral angles between the pyrazole ring and its N- and C-bonded benzene rings are 8.28 (11) and 40.89 (10)°, respectively. The dihedral angle between the benzene rings is 39.03 (11)°. The title mol­ecule exists in a trans conformation with respect to the acyclic C=C bond. In the crystal, mol­ecules are linked into inversion dimers by pairs of inter­molecular C—H⋯O hydrogen bonds, generating R 2 2(14) loops