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Wyświetlanie 1-15 z 68
Tytuł:
FT-IR and NMR spectral LFER model analysis on some 3-(1-naphthyl)-1-substituted phenyl chalcones
Autorzy:
Sekar, K. G.
Janaki, P.
Muthuvel, I.
Sathiyendiran, V.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1031827.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1-Naphthyl styryl ketone
Aldol condensation
IR and NMR Spectra
LFER Model
Opis:
In this investigation, the authors predicted the effects of substituents on the functional groups of the titled chalcones using Linear Free Energy Relationship through Hammett equation with its constants and Swain-Lupton parameters. The LFER model statistical analysis was carried out using single and multi-linear regression analysis in MS Office 365 XL package. From the LFER analysis outcome, the influence of substituents on the spectroscopic functionality were discussed with their electronic effects such as, polar, inductive, resonance, field and conjugation. The titled compounds were prepared by solvent-free Aldol-Condensation method. The prepared compounds were characterised by their physical constants, micro analysis and spectroscopic data (FT-IR, NMR and Mass).
Źródło:
World Scientific News; 2020, 147; 88-103
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral correlation analysis and evaluation of antimicrobial activities of some (E)-1-(2,4-dimethylthiazol-5-yl)-3-phenylprop-2-en-1-ones
Autorzy:
Sathiyendiran, V.
Balaji, S.
Senbagam, R.
Vijayakumar, R.
Manikandan, V.
Rajarajan, M.
Muthuvel, I.
Markandan, R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1031849.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4-dimethylthiazol enones
Antimicrobial activities
Crossed-Aldol condensation
E-2
IR and NMR spectra
Spectral correlation analysis
Substituent effects
UV
Opis:
In this work, an attempt was made to synthesized (E)-1-(2,4-dimethylthiazol-5-yl)-3-phenylprop-2-en-1-one by cross-aldol condensation reaction of 5′-acetyl-2,4-dimethylthiazole with various substituted Benz aldehyde in the presence base (sodium hydroxide). The synthesized (E)-1-(2,4-dimethylthiazol-5-yl)-3-phenylprop-2-en-1-one derivative was characterized by physical constants, UV, FT-IR, 1H-NMR & 13C-NMR spectral data. All the observed spectral data of substituted (E)-1-(2,4-dimethylthiazol-5-yl)-3-phenylprop-2-en-1-one compounds have been correlated with Hammett substituent constants(σ, σ+, σI & σR) and F and R parameters using single and multi-linear regression analyses and studied for their anti-microbial activities and compared with the standard drugs (Ciprofloxacin). Some compound of the series exhibited promising anti-microbial activity compared to standard drugs (Ciprofloxacin).
Źródło:
World Scientific News; 2020, 141; 66-90
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of substituents on 4-(substituted phenyl sulfonamide)benzoic acids by IR and NMR spectra
Autorzy:
Muthuvel, I.
Thirunarayanan, G.
Dineshkumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/1059444.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4-(substituted phenyl sulfonamide) benzoic acids
Hammett correlations
IR and NMR spectra
Regression analysis
Opis:
About nine 4-(substituted phenyl sulfonamide) benzoic acid derivatives were synthesized by ultrasound irradiation method. The synthesized sulfonamides were characterized by their physical constants and spectroscopic data. The characteristic infrared SOsym, SOasym, NH and CO vibrations (ν, cm-1), the chemical shifts (δ, ppm) of NH and CO of sulfonamides were assigned and correlated with various Hammett substituent constants and Swain-Lupton parameters using single and multi-regression analysis. From the results of the statistical analysis, the effects of substituents on the spectral frequencies were discussed.
Źródło:
World Scientific News; 2019, 128, 2; 216-233
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FT-IR, 1H and 13C NMR QSAR and molecular docking study on some (E)-2-(2-((aryl)(phenyl)methylene) hydrazinyl)benzo[d]thiazoles
Autorzy:
Muthuvel, I.
Thirunarayanan, G.
Manikandan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1066169.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d]thiazoles
Docking analysis
Hammett equation
IR spectra
NMR spectra
QSAR study
Schiff’s bases
Opis:
About six (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d]thiazoles have been synthesized and characterized by literature data. The infra-red stretching frequencies (ν, cm-1) of NH, CN, C=C and the NMR chemical shifts (δ, ppm) of NH, C=N and ipso carbons were assigned. These spectroscopic data were correlated for studying the QSAR employing Hammett equation with various Hammett substituent constants, Swain-Lupton’s F and R parameters using single and multi-regression analysis. From the results of regression analysis, the QSAR will be predicted by means of effects of substituents on the spectroscopic data of the functional group frequencies. The molecular docking character was evaluated by Schrodinger program, probing analogue docking in Topoisomerase enzymes. The crystallographic enzyme ligand complex (PDB entry 3TTZ) was obtained from the RCSB Protein Data Bank.
Źródło:
World Scientific News; 2019, 131; 54-74
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid acidic Bentonite/FeCl3 catalysed solvent-free cyclization of some aryl enones: Synthesis and assessment of antimicrobial potentials of some aryl pyrazolines
Autorzy:
Thirunarayanan, G.
Dineshkumar, N.
Rajarajan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1076026.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1
3
5-Substituted pyrazolines
Antimicrobial activities
Bentonite/FeCl3
IR and NMR Spectra
Solvent-free synthesis
Opis:
Some aryl pyrazolines including 3-(substituted phenyl)-5-(naphthalen-1-yl)-1-phenyl-4,5-dihydro-1H-pyrazoles were prepared by microwave irradiation promoted cyclization of aryl enones and phenylhydrazine in the presence of solid acidic bentonite/FeCl3 catalyst under solvent-free conditions. In this cyclization the obtained yields are more than 75%. The structural analysis of these pyrazoline derivatives were confirmed through analytical and spectral techniques. The effect of catalyst and solvent on this cyclization also investigated through the obtained yields. The antimicrobial activities of these pyrazoline derivatives were assessed through measurement of mm of zone of inhibition against their micro stains using well known Bauer-Kirby disc diffusion method.
Źródło:
World Scientific News; 2019, 117; 14-28
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Hammett spectral QSAR analysis of some (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
Autorzy:
Vijayakumar, S.
Manikandan, V.
Arulkumaran, R.
Christuraj, P.
Sundararajan, R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1076503.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
IR
NMR spectra
QSAR study
UV
regression analysis
Opis:
About nine substituted (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones have been synthesized by solvent-free method. These enones were analyzed by spectral techniques. The characteristic spectral frequencies were correlated through Hammett equation with Hammett substituent constants, F and R parameters using single and multi-regression analysis method. From the statistical analysis results, the quantitative structure activity relationships have been discussed by means of effects of substituents on the spectral frequencies.
Źródło:
World Scientific News; 2019, 115; 52-67
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasonicated Synthesis of Bio-potent Sulphonamides
Autorzy:
Thirunarayanan, Ganesamooorthy
Powiązania:
https://bibliotekanauki.pl/articles/1075695.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial activity
Antioxidant activity
Aryl sulfonamides
IR and NMR spectra
Sodium acetate
Ultrasonication
Opis:
About more than 85% yields of some aryl sulphonamides were synthesised by sodium acetate catalysed ultrasonication promoted condensation of aryl amines and benzene sulfonyl chlorides in room temperature. The synthesised sulfonamides were analysed with their physical constants, micro analysis and spectral techniques. The antioxidant potential of these sulfonamides were assessed by DPPH radical scavenging activity measurement using L-ascorbic acid as a standard. Antimicrobial activities of these sulfonamides have been assessed by disc diffusion method against their antimicrobial stains. Most of the sulfonamides shows antimicrobial activity. Many of the hydroxy and methoxy substituted sulfonamides showed significant antioxidant activity.
Źródło:
World Scientific News; 2019, 119; 125-138
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural analysis of two poly(propyl acrylates): poly(n-propyl acrylate) and poly(isopropyl acrylate), based on the carbonyl signal in the 13C NMR spectra
Analiza mikrostrukturalna dwóch poli(akrylanów propylu): poli(akrylanu n-propylu) i poli(akrylanu izopropylu), na podstawie sygnału węgla karbonylowego w widmach 13C NMR
Autorzy:
Pasich, M.
Henzel, N.
Matlengiewicz, M
Powiązania:
https://bibliotekanauki.pl/articles/946319.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
poly(n-propyl acrylate)
poly(isopropyl acrylate)
microstructure
NMR spectroscopy
poli(akrylan n-propylu)
poli(akrylan izopropylu)
mikrostruktura
spektroskopia NMR
Opis:
The samples of poly(n-propyl acrylate), PnPrA, and poly(isopropyl acrylate), PiPrA, were synthesized by free radical polymerization in solution (butan-2-one). The 100 MHz 13C NMR spectra of these homopolymers were recorded in two deuterated solvents: chloroform (CDCl3) and benzene (C6D6). In the spectra of both PnPrA and PiPrA recorded in CDCl3 the carbonyl signal was split at the level of configurational triads, while in C6D6 this signal revealed heptad splitting for PiPrA and pentad splitting for PnPrA.
Próbki poli(akrylanu n-propylu), PnPrA, i poli(akrylanu izopropylu), PiPrA, otrzymano w polimeryzacji rodnikowej w roztworze butan-2-onu. Widma 100 MHz 13C NMR tych homopolimerów zarejestrowano w dwóch deuterowanych rozpuszczalnikach: chloroformie (CDCl3) i benzenie (C6D6). Na widmach PnPrA i PiPrA, zarejestrowanych w deuterowanym chloroformie, sygnał węgli karbonylowych (C=O) ulega rozszczepieniu na poziomie triad konfiguracyjnych, podczas gdy dla deuterowanego benzenu sygnał C=O PiPrA rozszczepia się na poziomie heptad, a dla PnPrA pentad konfiguracyjnych.
Źródło:
Przetwórstwo Tworzyw; 2018, T. 24, Nr 1 (181), 1 (181); 56-63
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and effects of substituent on (E)-styryl-3-methyl-2-thienyl chalcones
Autorzy:
Christuraj, P.
Geetha, C.
Vanangamudi, G.
Arulkumaran, R.
Manikandan, V.
Rajakumar, P. R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1161056.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones
FT-IR & NMR spectra
Fly-ash:H3PO4 nanocatalyst
Hammett correlation analysis
Substituent effects
UV
solvent-free synthesis
Opis:
Series of eleven substituted of (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones compounds by cross-aldol condensation reaction of 3-methylthiophene-2-carbaldehyde with various substituted acetaldehyde in the occurrence of Fly-Ash: H3PO4 catalyst. The effect of catalytic activity of this fly-ash:H3PO4 nanocatalyst was studied with the obtained yield of products under solvent-free conditions. The synthesized substituted (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-one compounds was characterized by physical constants, UV, FT-IR, 1H & 13C-NMR spectral data. The infrared group frequencies of ʋ(cm-1) of COs-cis & s-trans, CHip and CHop, CH=CHop, >C=C
Źródło:
World Scientific News; 2018, 112; 55-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and spectral correlation studies of some (E)-N′-1-(substituted benzylidene) benzohydrazides
Autorzy:
Manikandan, V.
Balaji, S.
Senbagam, R.
Vijayakumar, R.
Rajarajan, M.
Vanangamudi, G.
Arulkumaran, R.
Sundararajan, R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1162032.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-N’-1-(substituted benzylidene) benzohydrazides
IR and NMR spectra and Correlations
UV
Opis:
About ten substituted (E)-N’-1-(substituted benzylidene) benzohydrazides have been synthesized. They are characterized by their analytical, ultraviolet, infrared and NMR spectral data. The effects of substituent on these data have been studied using Hammett equation.
Źródło:
World Scientific News; 2018, 111; 26-39
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral (FT-IR, 1H and 13C NMR) and antimicrobial studies some of (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d] thiazole
Autorzy:
Manikandan, S.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1177421.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aryl hydrazone
IR and NMR spectra
antibacterial and antifungal activities
Opis:
A series of (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d] thiazole compounds by condensation of substituted benzophenone with 2-hydrazinobenzothizol in the presence acetic acid. The synthesized compounds 1-6 were characterized by elemental, FT-IR, 1H and 13C NMR spectral data. From the IR and NMR spectra, the characteristic frequencies were assigned and the data used for confirmation of the formation hydrazones 1-6. All compounds were screened for their preliminary antibacterial and antifungal activities. The methoxy substituted compound 6 shows good antibacterial activity against their bacterial strains within the agreed mm of zone of inhibition. The methyl (5) and methoxy (6) substituted hydrazones show good antifungal activities against their fungal strains.
Źródło:
World Scientific News; 2018, 103; 1-18
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones
Autorzy:
Thirunarayanan, G.
Kumar, N. Dinesh
Powiązania:
https://bibliotekanauki.pl/articles/1179609.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial activities
Aryl chalcones
Cu2+/Zeolite
IR and NMR spectra
Opis:
Some aryl chalcones have been synthesized by Cu2+/Zeolite catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes under microwave irradiation conditions. The yields of the synthesized chalcones are more than 85%. These chalcones were characterized by their physical constants and spectroscopic data. The antimicrobial activities of synthesized chalcones were studied by Bauer-Kirby disc diffusion method.
Źródło:
World Scientific News; 2017, 74; 251-266
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Greener synthesis and Hammett spectral Linearity’s of some 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines
Autorzy:
Thirunarayanan, G.
Rajarajan, M.
Sekar, K. G.
Sathiyendiran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1179600.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Hammett equation and Regression analyses
Hammett substituent constants
IR and NMR spectra
Piperazines
Opis:
We have synthesized eleven numbers of 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines by hydroxyapatite catalyzed microwave assisted condensation method. The synthesized 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazine compounds were characterized by means of their IR and NMR spectral data. The assigned infrared spectral νC=N, νC-O-C stretches(cm-1), NMR chemical shifts of isoxazoline (d) proton, isoxazoline (m) proton, N-CH3, C=N, C-NH2 and C-NH3 (δ, ppm) of these 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines were assigned and correlated with Hammett substituent constants, F and R parameters using single and multi linear regression analysis. From the results of statistical analyses, the effects of substituents on the above group frequencies were discussed.
Źródło:
World Scientific News; 2017, 74; 164-180
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hammett spectral LFER of some antioxidant substituted benzylidene hydrazines
Autorzy:
Thirunarayanan, G.
Manikandan, V.
Arulkumaran, R.
Rajarajan, M.
Sathiyendiran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1182556.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-(2
5-dinitrophenyl)-2-(substituted benzylidene)hydrazines
Hammett correlations
IR spectra
NMR spectra
antioxidant activity
hydroxy apatite
Opis:
About nine (E)-(2,5-dinitrophenyl)-2-(substituted benzylidene)hydrazines have been synthesized by hydroxy apatite catalyzed condensation of 2,4-dinitrophenyl hydrazine and substituted benzaldehydes under microwave irradiation conditions. The obtained yields of these hydrazines are more than 85%. The purities of synthesized hydrazines are examined by the analytical and spectroscopic data reported earlier. The infrared spectral C=N, NH frequencies (v, cm-1) and the NMR spectral chemical shifts of CH, NH protons and carbons are assigned and are correlated with Hammett substituent constants, F and R parameter using single and multi-regression analysis. From the results of statistical analysis the effects of substituent on the group frequencies have been discussed. The antioxidant activities of these synthesized hydrazines were measured using DPPH radical scavenging method. The hydroxy- and methoxy- substituted hydrazines shows significant antioxidant activity.
Źródło:
World Scientific News; 2017, 69; 201-219
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QSAR study of infrared and nuclear magnetic resonance spectra of 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines
Autorzy:
Ananthi, V.
Rajalakshmi, K.
Thiruarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1178520.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines
FeCl3/Bentonite
Hammett equation
IR and NMR spectra
QSAR study
Solvent-free synthesis
Opis:
Ten 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines have been synthesized by FeCl3/Bentonite catalyzed solvent-free condensation of substituted phenyl hydrazine and aldehydes under microwave irradiation. The synthesized hydrazides are characterized by the physical constants, micro analysis and spectroscopic data. The assigned characteristic spectroscopic data of these 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines were correlated with Hammett substituent constants, F and R parameters using Hammett equation through single and multi-regression analysis. With the results of statistical analysis results, the quantitative structure activity relationships were studied and finding the effect of substituents on the spectral data.
Źródło:
World Scientific News; 2017, 70, 2; 122-139
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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