Crystal structure, DFT and Hirshfeld surface analysis of 2-amino-4-(2-chlorophenyl)-7-hydroxy-4H-benzo[1,2-b]pyran-3-carbonitrile M. Beemarao, S. Silambarasan, A. Jamal Abdul Nasser, M. Purushothaman, K. Ravichandran Acta Crystallographica Section E Crystallographic Communications, 2019 The benzopyran ring of the title compound, C16H11ClN2O2, is planar [maximum deviation = 0.079 (2) Å] and is almost perpendicular to the chlorophenyl ring [dihedral angle = 86.85 (6)°]. In the crystal, N—H...O, O—H...N, C—H...O and C—H...Cl hydrogen bonds form inter- and intramolecular interactions. The DFT/B3LYP/6-311G(d,p) method was used to determine the HOMO–LUMO energy levels. The molecular electrostatic potential surfaces were investigated by Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyse the intermolecular interactions in the molecule.
Crystal structures of two 4H-chromene derivatives: 2-amino-3-cyano-4-(3,4-dichlorophenyl)-7-hydroxy-4H-benzo[1,2-b]pyran 1,4-dioxane monosolvate and 2-amino-3-cyano-4-(2,6-dichlorophenyl)-7-hydroxy-4H-benzo[1,2-b]pyran S. Silambarasan, A. Jamal Abdul Nasser, T. Mohandas Acta Crystallographica Section E Crystallographic Communications, 2019 In the title compounds, C16H9Cl2N2O2·C4H8O2 and C16H9Cl2N2O2, the bicyclic 4H-chromene cores are nearly planar with maximum deviations of 0.081 (2) and 0.087 (2) Å. In both structures, the chromene derivative molecules are linked into centrosymmetric dimers by pairs of N—H...O hydrogen bonds, forming R2 2 (16) motifs. These dimers are further linked in the 3,4-dichlorophenyl derivative by N—H...N hydrogen bonds into double layers parallel to (100) and in the 2,6-dichlorophenyl derivative by O—H...N hydrogen bonds into ribbons along the [1\\overline{1}0] direction. In the 3,4-dichlorophenyl derivative, the 1,4-dioxane solvent molecules are connected to the chromene molecules via O—H...O hydrogen bonds.
Comparative study of N-[(4-methoxyphenyl) (morpholin-4-yl)methyl]acetamide (MMPA) and N-[morpholin-4-yl(phenyl)methyl]acetamide (MPA) as corrosion inhibitors for mild steel in sulfuric acid solution A. Jamal Abdul Nasser, M. Anwar Sathiq Arabian Journal of Chemistry, 2017 Two Mannich bases namely, N -[(4-methoxyphenyl)(morpholin-4-yl)methyl]acetamide (MMPA) and N -[morpholin-4-yl(phenyl)methyl]acetamide (MPA) were synthesized and their influence on the inhibition of corrosion of mild steel in 1.0 M H 2 SO 4 was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and FT-IR spectroscopy. The weight loss measurements showed that these inhibitors have excellent inhibiting effect at a concentration of 0.01 M. The inhibitor efficiency was found to depend on both concentration and molecular structure of the inhibitor. Both the compounds have been found to be relatively good inhibitors. Potentiodynamic polarization curves revealed that the studied inhibitors represent a mixed-type, predominantly cathodic control. An equivalent circuit is suggested based on an analysis of EIS data. The negative value of standard free energy of adsorption in the presence of inhibitor suggests spontaneous adsorption of inhibitors on the mild steel surface. The activation energy of corrosion and other thermodynamic parameters were calculated to elaborate the mechanism of corrosion inhibition. The Temkin isotherm was found to provide an accurate description of the adsorption behavior of the inhibitors. Surface analysis using scanning electron microscope (SEM) shows a significant morphological improvement on the mild steel surface with the addition of inhibitors. FT-IR spectra revealed the interaction between inhibitor molecules and mild steel surface.
N-[Morpholin-4-yl(phenyl)methyl]acetamide as corrosion inhibitor for mild steel in hydrochloric acid medium A. Jamal Abdul Nasser, M. Anwar Sathiq Arabian Journal of Chemistry, 2016 The inhibiting effect and adsorption behavior of N -[morpholin-4-yl(phenyl)methyl]acetamide (MPA) on mild steel in hydrochloric acid solution were studied by weight loss measurements, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy techniques. The inhibitor showed greater than 90% inhibition efficiency at 0.01 M. Potentiodynamic polarization studies showed that the inhibition action is concentration dependent, at low concentration anodic, higher concentration cathodic, inhibition predominant. Electrochemical impedance spectroscopy (EIS) confirmed that changes in the impedance parameters ( R t and C dl ) are due to surface adsorption. The inhibition efficiencies obtained from weight loss measurements and electrochemical tests were in good agreement. The adsorption process of MPA at the mild steel/hydrochloric acid solution interface is described by Langmuir adsorption isotherm model. The negative value of standard free energy of adsorption in the presence of inhibitor suggests spontaneous adsorption of MPA molecule on the mild steel surface. The activation energy of corrosion and other thermodynamic parameters were calculated to elaborate the mechanism of corrosion inhibition.
Anti-Inflammatory Activity of New Series of 1,4-Dihydropyridine Derivatives A. Idhayadhulla, R. Surendra Kumar, A. Jamal Abdul Nasser, S. Kavimani, S. Indhumathy Pharmaceutical Chemistry Journal, 2015 Aseries of 1,4-dihydropyridine derivatives (1a – 1g) were prepared by multicomponent condensation reaction of ethylchloroacetate, 4-substituted benzaldehyde, and ammonium hydroxide as starting materials. A new series of dihydrazine carbothioamides (2a – 2g) were prepared by condensation of compounds 1a – 1g with thiosemicarbazide. The structures of synthesized compounds were confirmed by IR and 1H-NMR spectroscopy and elemental analysis. Compounds 1a – g and 2a – 2g were tested for anti-inflammatory activity on Swiss albino rats.
Synthesis and evaluation of antimicrobial activity of novel 3-{[1-pyridin-2-yl methylene]amino}-2-thioxoimidazolidin-4-one analogues Der Pharmacia Lettre, 2015
Inhibition effect of copper complex of 1-(8-hydroxy quinolin-2-yl-methyl) thiourea on the corrosion of mild steel in sodium chloride solution Abuthahir S.S. Syed, Nasser A. Jamal Abdul, Rajendran S. Open Materials Science Journal, 2014 The Corrosion inhibition of an inhibitor namely Copper complex of 1-(8-hydroxy quinolin-2-yl-methyl) thiourea (Cu-HTF) which controls the corrosion of mild steel immersed in an aqueous solution containing 60 ppm Cl- has been investigated through electrochemical and mass loss method. The formulation consisting of 60 ppm of Cl- and 50 ppm of Cu-HTF offers good inhibition efficiency of 78 %. Polarization study shows that this formulation acts as a cathodic inhibitor.AC impedance spectra indicate that a protective film is formed on the mild steel surface. Fluorescence spectral analysis was used to detect the presence of iron-inhibitor complex. The surface morphology has been analyzed by FTIR, UV-Visible spectroscopy, Scanning Electron Microscope (SEM) and EDAX. Cu-HTF has the ability to prevent the growth of certain microorganisms such as E. coli, Streptococcus, Pseudomonas and Enterobacter.
Synthesis, Characterization and biological activity of certain pyrazole derivatives Journal of Chemical and Pharmaceutical Research, 2014
Synthesis, characterization and antimicrobial activity of new pyrrole derivatives Journal of the Mexican Chemical Society, 2011
Synthesis of some new pyrrole derivatives and their antimicrobial activity Der Pharma Chemica, 2011
Synthesis and antimicrobial activity of some new mannich base derivatives Journal of Chemical and Pharmaceutical Research, 2011
Synthesis and anticancer activity of some new series of 1, 4-dihydropyridine derivatives Indian Journal of Chemistry Section B Organic and Medicinal Chemistry, 2011
Synthesis and antimicrobial activity of some 2-thioxo-imidazolidin-4-onesa Indian Journal of Heterocyclic Chemistry, 2009
Synthesis and biological activity of some 3, 1-substituted-2-thioxo- imidazolin-4-one, imidazoline-2.4-dione derivatives Indian Journal of Heterocyclic Chemistry, 2008
Aliphatic sulfides: Effective corrosion inhibitors for mild steel in sulfuric acid Bulletin of Electrochemistry, 2005