- Design, synthesis, growth and characterization of 4-methoxy-4′- dimethylamino-benzylidene aniline (MDMABA): A novel third order nonlinear optical material
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Synthesis, growth, X-ray crystal structure and characterization of a novel third order nonlinear optical material, 4-methoxy-4′-dimethylamino- benzylidene aniline (MDMABA), are reported for the first time. The asymmetric unit of MDMABA compound contains two crystallographically independent molecules (A and B), and they exist in the E-configuration. The structural perfection of the grown crystal is analyzed by high-resolution X-ray diffraction rocking curve analysis. The functional groups present in MDMABA are investigated by FTIR and FT-Raman spectral analyses. The placement of the protons is determined using HNMR spectrum. The range and percentage of optical transmission were ascertained by recording UV-vis-NIR spectrum. Thermal and mechanical properties are reported. Dielectric study shows that the dielectric constant of the crystal varies with frequency and temperature. The third order nonlinear optical absorption coefficient of the MDMABA crystal is determined by the Z-scan technique.
- Leela,Hema,Stoeckli-Evans, Helen,Ramamurthi,Bhagavannarayana
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- Conversion of aldimines to secondary amines using iron-catalysed hydrosilylation
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Iron-catalyzed hydrosilylation of imines to amines using a well-defined iron complex is reported. This method employs relatively mild conditions, by reaction of imine, (EtO)3SiH in a 1 : 2 ratio in the presence of 1 mol% precatalyst ([BIAN]Fe(η6-toluene), 3, BIAN = bis(2,6-diisopropylaniline)acenaphthene) at 70 °C. A broad scope of imines was readily converted into the corresponding secondary amines without the need for precatalyst activators.
- Saini, Anu,Smith, Cecilia R.,Wekesa, Francis S.,Helms, Amanda K.,Findlater, Michael
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supporting information
p. 9368 - 9372
(2019/01/03)
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- Solvent-free synthesis, spectral correlations and antimicrobial activities of some aryl imines
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A series of aryl imines have been synthesized by Fly-ash: H 2SO4 catalyzed microwave assisted process under solvent-free conditions. The yields of the imines have been found to be more than 87%. The purity of all imines has been checked using their physical constants and spectral data as published earlier in literature. The UV λmaxCN(nm), infrared νCN(cm-1), NMR δ(ppm) of CH and CN spectral data have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied. The antimicrobial activities of All synthesised imines have been studied using Bauer-Kirby method.
- Suresh,Kamalakkannan,Ranganathan,Arulkumaran,Sundararajan,Sakthinathan,Vijayakumar,Sathiyamoorthi,Mala,Vanangamudi,Thirumurthy,Mayavel,Thirunarayanan
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p. 239 - 248
(2013/02/22)
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- An expeditious one-pot synthesis of substituted phenylazetidin-2-ones in the presence of zeolite
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In this study, one-pot rapid and efficient series of phenylazetidin-2-ones were synthesized from N,N-dimethylaminobenzaldehyde, different substituted aromatic amines and phenylacetyl chloride in the presence of zeolite catalyst under microwave irradiation. We also reported schiff bases (1a-j) by classical and conventional microwave technique. The titled compounds are evaluated for their antimicrobial properties. The activities are due to Ci=O, Ci-N, linkages in 2-azetidinones. All the compounds have shown comparable antibacterial activities.
- Pagadala, Ramakanth,Meshram, Jyotsna S.,Chopde, Himani N.,Jetti, Venkateshwarlu,Udayini
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experimental part
p. 1067 - 1072
(2011/10/31)
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- Inhibition effect of nitrogen containing ligands on corrosion of aluminium in acid media with and without KCl
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Mass loss and thermometric methods have been used to study the corrosion inhibition of aluminium in HCl solution by nitrogen containing ligands viz. N-(4-N,N-dimethylaminobenzal)-p-anisidine (SB1), N-(4-N,N- dimethylaminobenzal)-p-toluidine (SB2) and N-(4-N,N- dimethylaminobenzal)-2,4-dinitroaniline (SB3). Results of inhibition efficiencies obtained from these two methods are in good agreement and have been found to be dependent upon the concentration of inhibitors as well as concentration of acids. Inhibition efficiency of synthesized ligands has also been studied in the presence of KCl with inhibitors.
- Sethi,Chaturvedi,Upadhyay,Mathur
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p. 591 - 598
(2008/09/19)
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- Substituent cross-interaction effects on the electronic character of the C=N bridging group in substituted benzylidene anilines - Models for molecular cores of mesogenic compounds. A 13C NMR study and comparison with theoretical results
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13C NMR chemical shifts δc(C=N) were measured in CDCl 3 for a wide set of mesogenic molecule model compounds, viz. the substituted benzylidene anilines P-X-C6H4CH=NC 6H4-p-Y (X = NO2, CN, CF3, F, Cl, H, Me, MeO, or NMe2; Y = NO2, CN, F, Cl, H, Me, MeO, or NMe2). The substituent dependence of δc(C=N) was used as a tool to study electronic substituent effects on the azomethine unit. The benzylidene substituents X have a reverse effect on δc(C=N): electron-withdrawing substituents cause shielding, while electron-donating ones behave oppositely, the inductive effects clearly predominating over the resonance effects. In contrast, the aniline substituents Y exert normal effects: electron-withdrawing substituents cause deshielding, while electron-donating ones cause shielding of the C=N carbon, the strengths of the inductive and resonance effects being closely similar. Additionally, the presence of a specific cross-interaction between X and Y could be verified. The electronic effects of the neighboring aromatic ring substituents systematically modify the sensitivity of the C=N group to the electronic effects of the benzylidene or aniline ring substituents. Electron-withdrawing substituents on the aniline ring decrease the sensitivity of δc(C=N) to the substitution on the benzylidine ring, while electron-donating substituents have the opposite effect. In contrast, electron-withdrawing substituents on the benzylidene ring increase the sensitivity of δc(C=N) to the substituent on the aniline ring, while electron-donating substituents act in the opposite way. These results can be rationalized in terms of the substituent-sensitive balance of the electron delocalization (mesomeric effects). The present NMR characteristics are discussed as regards the computational literature data. Valuable information has been obtained on the effects of the substituents on the molecular core of the mesogenic model compounds.
- Neuvonen, Helmi,Neuvonen, Kari,Fueloep, Ferenc
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p. 3141 - 3148
(2007/10/03)
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- An in-depth analysis of the effect of substituents on imines in cycloaddition reactions with nitrosoalkenes
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An in-depth experimental and theoretical analysis of the reactions of simple acyclic imines with nitrosoalkenes is reported. The effect of the substituents on nitrogen as well as carbon atom of imines on the cycloaddition pathways followed is systematically explored. The reactions of various functionalized imines with nitrosoalkenes leading to the formation of imidazoles and imidazole-N-oxides have also been explored. The plausible mechanisms leading to various heterocycles have been proposed.
- Marwaha, Alka,Singh, Parvesh,Mahajan, Mohinder P.
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p. 5474 - 5486
(2007/10/03)
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- Studies on Mixed Liquid Crystal. Part-I. Nemetic Mesophase induced by Mixing Two Non-liquid Crystalline Components and Determination of Latent Transition Temperature
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Eight binary systems consisting of both non-liquid crystalline components, viz. p-methoxyphenyl-p''-methoxy benzoate and Schiff base have been studied.One of the eight binary systems involving Schiff base p-tolual-p-phenetidine was found to give monotropi
- Doshi, A.V.,Joshi, N.N.
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p. 807 - 810
(2007/10/02)
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- Vibrational spectra and Raman excitation profiles of some Schiff bases
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The pre-resonance Raman spectra of three Schiff-base have been recorded and analysed.The theoretical Raman intensity factors have been calculated using ALBRECHT and HUTLEY's theory for pre-resonance enhancement and are compared with those of experimentally observed values.The assignments of the fundamental modes of vibration in the range 1300-1700 cm-1 have also been attempted on the basis of i.r. and Raman data.
- Das, Radhendu,Kumar, Kamal
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p. 705 - 710
(2007/10/02)
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- Aryliminodimagnesium Reagents. XI. Two-Electron Oxidation of the Reagent Molecules in the Reaction with Some Oxidizing Agents and with Strongly Push-Pull Substituted α-Benzylideneacetophenones
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The reactions of an aryliminomagnesium reagent (ArN(MgBr)2) with four oxidizing agents ((i): I2, OsO4, C6H5IO2, I2O5) and four push-pull substituted α-benzylideneacetophenones (ii) were examined.In the reactions with (i), the maximum yield of sym-azobenzene was 50percent.In the reactions with (ii), in addition to products formed via condensation and the typical radical processes, unexpected products formed via cleavages of C=C and Cβ-H bonds were observed.Summarizing these results, a pathway involving the formation of arylnitrene-like species via disproportionation of arylaminyl radicals has been proposed.
- Okubo, Masao,Yoshida, Shunsei,Egami, Yoshiji,Matsuo, Koji,Nagase, Shigeru
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p. 1741 - 1746
(2007/10/02)
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