(E)-4-Bromo-N-(2,3-dimeth­oxy­benzyl­idene)aniline

The title Schiff base compound, C15H14BrNO2, was prepared by the condensation of 2,3-dimeth­oxy­benzaldehyde with 4-bromo­aniline. It adopts an E configuration with respect to the C=N bond. The dihedral angle between the two aromatic rings is 56.79 (8)°. Weak C—H⋯O and C—-H⋯π bonds can be found in the crystal structure

N,N′-Bis(2,3-dimethoxy­benzyl­idene)propane-1,3-diamine

The title compound, C21H26N2O4, adopts an E configuration with respect to the azomethine C=N bonds. The dihedral angle between the two rings is 8.16 (8)°. The crystal structure is stabilized by weak inter­molecular C—H⋯O inter­actions

(E)-N-(2,4-Dimeth­oxy­benzyl­idene)-4-ethoxyaniline

In the title compound, C17H19NO3, the mol­ecule has an E configuration with respect to the C=N bond and the dihedral angle between the aromatic rings is 56.07 (5)°. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds occur. The dimers are linked by weak C—H⋯π inter­actions, forming a three-dimensional network

4-Bromo-N-(3,4,5-trimethoxy­benzyl­idene)aniline

The title compound, C16H16BrNO3, adopts an E configuration with respect to the imine C=N bond. The two benzene rings are twisted with respect to each other at an angle of 38.3 (1)°. In the crystal structure, mol­ecules are connected by weak bifurcated C—H⋯(O, O) hydrogen bonds, forming a helical chain along the b axis

(E)-4-Bromo-N-(2,3,4-trimeth­oxy­benzyl­idene)aniline

The title Schiff base compound, C16H16BrNO3, adopts an E configuration with respect to the C=N bond. The dihedral angle between the two aromatic rings is 64.02 (6)°

Chemiluminescence determination of pethidine hydrochloride and thebaine alkaloides

The aim of this work was finding new flurescent dyes as sensitizers for chemiluminescence (CL) determination some of narcotics. In this way 6 different dyes incloding rhodamine 6G, brilliant blue, orange G, chromatrope, eosin‌‌Y and [Ru(phen)3]2+ and 14 drugs incloding pethidine hydrochloride, thebaine, dextromethorphan, acetaminophen, codeine, oxymorphone, oxycodone, morphine, pholcodine, naltrexone, buprenorphine, methadone, tramadol, diphenoxylate were investigated. In the preliminary experiments, we found that pethidine hydrochloride in CL system of [Ru(phen)3]2+- Ce(IV) and thebaine in CL system of rhodamine 6G- Ce(IV) could be determined. After optimizing the important variables, linear dynamic range for pethidine hydrochloride and thebaine were 5.6×10-7 to 1.4×10-3 mol L-1 and 1.0×10-5 to 4.0×10-4 mol L-1 and limit of detection were 7.1×10-8 mol L-1 and 4.3×10-6 mol L-1, respectively. The percent of relative standard deviation for pethidine hydrochloride and thebaine were 5.7 and 4.0%, respectively

Synthesis and Characterization of Polysalicylaldehyde (PSA) by Oxidative Polycondensation of Schiff base Compound [(2,4-dichlorophenylimino)methyl]-phenol

In this paper, polysalisylaldehyde (PSA) has been synthesized from the oxidative polycondensation (OP) of 2-[(2,4-dichlorophenylimino)methyl]-phenol (sal-2,4-Clan) with NaOCl in an aqueous alkaline medium between 50 and 90°C and characterized by 1H-NMR, FT-IR, UV-Vis and TGA/DTA techniques. The conversion of PSA was 61.23% in optimum conditions such as [sal-2,4-Clan]0 = 0.02, [KOH]0= 0.1 [NaOCl]0 = 0.12 mol/L at 90°C for 10 h. Additionally, the crystal structure of sal-2,4-Clan has been determined by single-crystal X-ray crystallography

2-(3,4-Dimeth­oxy­phen­yl)-1H-benzimidazole

In title compound, C15H14N2O2, the dihedral angle between the 3,4-dimeth­oxy­phenyl group and the benzimidazole system is 26.47 (6)°. In the crystal, neighbouring mol­ecules are linked by N—H⋯N hydrogen bonds into C(4) chains propagating along the c-axis direction. The crystal structure also features weak C—H⋯O inter­actions

Theoretical and experimental study of the protonated 2,4,6-tri(2-pyridyl)-1,3,5-triazine [TPTZH 2 ] 2+

The reaction between 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ) and sulfuric acid in the presence of NH4PF6 yielded crystals of [TPTZH2](PF6)2·H2O, characterized by spectroscopic methods and single-crystal X-ray diffraction. The structural data indicat