The large volume of wastewater produced during unconventional oil and gas (UOG) extraction is a significant challenge for the energy industry and of environmental concern, as the risks due to leaks, spills, and migration of these fluids into natural waters are unknown. UOG wastewater is often hy...

The reaction of α,β-unsaturated aromatic (or heteroaromatic) carboxylic acids with N-halosuccinimides (1 equiv.) and catalytic tetrabutylammonium trifluoroacetate (0.2 equiv.) in dichloroethane results in facile halodecarboxylation affording the corresponding (E)-halides in good to excellent y...

Tryptophan (Trp) catabolizing enzymes play an important and complex role in the development of cancer. Significant evidence implicates them in a range of inflammatory and immunosuppressive activities. Whereas inhibitors of indoleamine 2,3-dioxygenase-1 (IDO1) have been reported and analyzed in t...

Serratia marcescens, capable of degrading 2-Nitrophloroglucinol (NPG), an endocrine disruptor, was isolated from the soil contaminated with tannery wastewater. The mixed intracellular enzymes (MICE) from S. marcescens were extracted and characterized. The activity of MICE was found to be the max...

Azo compounds were synthesized in a multi-step catalyst-free reaction by using tert-butyl nitrite as a diazotization reagent and a mixture of bis(trifluoromethane)-sulfonimide (CF3SO2)2NH, (TFSI-H) and glacial acetic acid as a mild acidic agent in ethanol/water mixed solvent followed by azo coup...

The behavior of diphenylformazans, 2-oxo-1,3-bis(phenylhydrazones), 1,2-bis-(phenylazo)ethylene, and the phenylhydrazone of 4-oxo-1-phenyl-5-phenylazo-3-pyridazinecarboxaldehyde on protonation has been examined spectrophotometrically. These compounds form purple, blue, or green protonated cation...

The reaction of [Ru(tpy)Cl3] with pap has afforded [Ru(tpy)(pap)Cl]+ which has been isolated and characterized as the perchlorate salt. Treatment of [Ru(tpy)(pap)Cl]+ with Ag+ in aqueous solution gives [Ru(tpy)(pap)(H2O)]2+. This aquo-complex has been reacted with three monodentate ligands (L′ ...

Reaction of AgNO3 and 1-alkyl-2-(naphthyl-(α/β)-azo)imidazole (α-/β-NaiR) in MeOH followed by the addition of NaClO4 has isolated [Ag(α-/β-NaiR)2](ClO4) (3/4). The complexes are characterized by microanalytical and spectral data. Single crystal X-ray diffraction study of bis-[1-ethyl-2-(na...

Three novel supramolecular complexes, [Ag4(2-mBIM)4](ClO4)4(H2O) (1), [Ag2(2-mBIM)2](PF6)2 (2) and [Ag2(PA-BIM)2](ClO4)2(CH2Cl2) (3) (2-mBIM = bis(2-methyl- imidazol-1-yl)methane; PA-BIM = 1,1-bis[(2-phenylazo)imidazol-1-yl]methane), have been prepared and structurally characterized. The reporte...

Co(ClO4)2 · 6H2O reacts with 1-alkyl-2-(arylazo)imidazoles [RaaiR′ where R = H (a), Me (b); R′ = Me (1/3), Et (2/4)] in methanol solution and gives brown crystalline compounds of [Co(RaaiR′)4](ClO4)2 · H2O (3, 4). They have been characterized by elemental analyses, spectral data and magneti...

The hetero-tris-chelates of the formulae [Ru(phen)(RaaiR′)2](ClO4)2 [phen=1,10-phenanthroline, RaaiR′=1-alkyl-2-(arylazo)imidazole, p-RC6H4NNC3H2NN-1-R′, where R=H (a), Me (b), Cl (c) and R′=Me (2), Et (3), CH2Ph (4)] have been isolated from the reaction of ctc-[RuCl2(RaaiR′)2] wi...

Bis-[1-alkyl-2-(naphthyl-(α/β)azo)imidazole]copper(I) perchlorate derivatives, [Cu(α-NaiR)2(ClO4)] and Cu(β-NaiR)2](ClO4), have been characterised by spectral and electrochemical studies. The single crystal X-ray structure of bis-[1-ethyl-2-(naphthyl-α-azo)imidazole]copper(I) perchlorate sh...

4-((Phenylimino)methyl)naphthalen-1-ol and 4-((phenylimino)methyl)-2-(piperidin-1-ylmethyl)naphthalen-1-ol have been synthesized and their tautomeric properties were investigated using molecular spectroscopy (UV–Vis absorption/emission and NMR), X-ray crystallographic analysis and quantum-chemi...

New complexes of copper(II) with azo compounds of 5-amino-2-(aryl diazenyl)phenol (HLn) are prepared and investigated by elemental analyses, molar conductance, IR, 1H NMR, UV–Visible, mass, ESR spectra, magnetic susceptibility measurements and thermal analyses. The complexes have a square plana...

Four novel o-hydroxy substituted aryl-(mH, Cl, Br, CH3) azo-5-pyrazolone compounds (2a–d, respectively) were synthesized as azo-group containing ligands by diazotization of aryl amines then coupled with 1-(4-chlorophenyl)-3-isopropyl-1H-pyrazol-5(4H)-one (1) and the structures were confirmed by...

The ligands 5-amino-2-(phenyldiazenyl)phenol and its derivatives (HLn) were synthesized from the coupling of 3-aminophenol with aniline and its p-derivatives and characterized by different spectroscopic techniques. The molecular and electronic structures of the investigated compounds (HLn) were ...

A series of azo-linked 4H-benzo[d][1,3]oxazine-2,4-diones were synthesized in excellent yields and short reaction time by one-pot reaction between various synthetized azo-linked carboxylic acids and carbon dioxide in the presence of [email protected]/MCM-41 nanocomposite as a novel catalyst at r...

Malondianilide (I) derived from p-chloroaniline was cyclized to 6-chloro-4-hydroxyquinoline-2(1H)-one (II) in moderately good yield using polyphosphoric acid as catalyst. This compound was then coupled with some diazotized aromatic amines to give the corresponding azo disperse dyes 1–12. A syst...

A convenient, one-pot three-component synthesis of new photochromic azo-imidazoles (1a-1h) from the corresponding azo dyes (2a-2h), benzil and ammonium acetate under microwave irradiation were described and their photochromic properties were investigated. The structures of the new azo-imidazoles...

Five azo dyes with ESIPT unit were used to study their application properties. These dyes were used for coloration on polyester (PET), acrylic (AC) and nylon (NY) fabrics. The various properties of fastness, UV blocking, UV protection properties were investigated. Elecrophilicity index was calcu...