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Wyszukujesz frazę "Vijayakumar, S." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Infrared spectral analysis of waste pet samples
    Autorzy:
    Vijayakumar, S.
    Rajakumar, P. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411833.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    butelki PET
    ABS
    FTIR
    mieszanki kompozytowe
    PET bottles
    FT-IR spectra
    blended composites
    Opis:
    There are fifteen waste pet bottles and a commercial grade ABS was collected from local supplier of Chidambaram town. The ABS was used to study the mechanical properties of PET blend composites. This study was performed by FT-IR spectroscopy. From the characteristics infra-red stretching bands the mechanical properties of samples were discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 4; 58-65
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations and antimicrobial activities of some 1-pyrenyl chalcones
    Autorzy:
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Sakthinathan, S.P.
    Kamalakkannan, D.
    Suresh, R.
    Ranganathan, K.
    Rajakumar, P.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411776.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 1-pyrenyl ketones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    A series of 1-pyrenyl chalcones have been synthesized by Crossed-Aldol condensation of 1-acetylpyrene and substituted benzaldehydes. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 5; 21-38
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thionylchloride catalyzed aldol condensation: Synthesis, spectral correlation and antibacterial activities of some 3,5-dichloro-2-hydroxyphenyl chalcones
    Autorzy:
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Sakthinathan, S. P.
    Kamalakkannan, D.
    Suresh, R.
    Ranganathan, K.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411825.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    chlorek tionylu
    widma IR i NMR
    korelacja Hammeta
    aktywność antybakteryjna
    wpływ podstawników
    styrylo 3,5-dichloro-2-hydroksy fenylo ketony
    thionyl chloride
    styryl 3,5-dichloro-2-hydroxyphenyl ketones
    IR and NMR spectra
    Hammett correlation
    substituent effects
    antimicrobial activities
    Opis:
    A series of substituted styryl 3,5-dichloro-2-hydroxyphenyl ketones [1-(3, 5-dichloro-2-hydroxy)- 3-phenylprop-2-en-1-one] were synthesized using thionyl chloride assisted Crossed Aldol reaction. The yields of chalcones were more than 80%. The synthesized chalcones were characterized by analytical and spectroscopic data. From the spectroscopic data the group frequencies were correlated with Hammett substituent constants, F and R parameters. From the results of statistical analysis the effect of substituents were discussed. The antibacterial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 4; 17-38
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical reduction potential correlation of some insect antifeedant potent 2-phenothiazinyl chalcones
    Autorzy:
    Ranganathan, K.
    Suresh, R.
    Kamalakkannan, D.
    Arulkumaran, R.
    Sundararajan, R.
    Sakthinathan, S. P.
    Vijayakumar, S.
    Thirumurthy, K.
    Mayavel, P.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411842.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    elektrochemia
    potencjał redukcji
    analiza korelacji
    2-phenothiazenyl
    chalkony
    2-Phenothiazenyl chalcones
    electrochemistry
    reduction potential
    correlation analysis
    insect antifeedant activities
    Opis:
    A series containing twelve substituted styryl 2-phenothiazenyl ketones have been synthesized. The electrochemical potentials of carbonyl and vinyl groups were measured. These potentials are correlated with Hammett substituent constants, F and R parameters. From the results of statistical analyses, the effects of substituent on the group reduction potentials have been discussed. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L with castor leaf discs.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 4; 66-75
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insect antifeedant potent halogen substituted phenyl chalcones
    Autorzy:
    Sundararajan, R.
    Arulkumaran, R.
    Vijayakumar, S.
    Kamalakkannan, D.
    Suresh, R.
    John, J. S.
    Ranganathan, K.
    Sakthinathan, S. P
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412081.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Substituted styryl 2′,3′,4′-trichlorophenyl ketones
    sulfated Titania
    IR and NMR spectra
    Insect antifeedant activities
    Opis:
    Some 2′,3′,4′-trichlorophenyl chalcones [(E)-1-(2,3,4-trichlorophenyl)-3-(substituted phenyl)-2-propen-1-ones] have been synthesised using sulfated Titania catalyzed solvent-free aldol condensation between 2,3,4-trichloroacetophenone and substituted benzaldehydes. The purities of synthesised chalcones were checked by their analytical, physical and spectroscopic data reported in literature. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L by castor leaf disc bio-assay method. The chloro substituted chalcones shows significant insect antifeedant activity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 1; 67-73
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of substituent effects and antimicrobial activities of some 2ʹ,5ʹ-dimethyl phenyl chalcones
    Autorzy:
    Joseph, S. J.
    Kamalakkannan, D.
    Arulkumaran, R.
    Sakthinathan, S. P.
    Suresh, R.
    Sundararajan, R.
    Vijayakumar, S.
    Ranganathan, K.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412597.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 2
    5ʹ-dimethyl phenyl chalcones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    Some 2ʹ,5ʹ-dimethyl phenyl chalcones have been synthesized by Crossed-Aldol condensation between 2,5-dimethyl acetophenone and various substituted benzaldehydes using catalytic amount of sodium hydroxide and ethanol. The yields of the chalcones are more than 93 %. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effects of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 5; 99-123
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations and antimicrobial activities of some (E)-N-Benzylidenepyridin-2-amines
    Autorzy:
    Sakthinathan, S. P.
    Suresh, R.
    Mala, V.
    Sathiyamoorthi, K.
    Kamalakkannan, D.
    Ranganathan, K.
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412108.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxidative coupling Solvent-free synthesis
    fly-ash
    PTS
    Aryl imines
    IR and NMR spectra
    Opis:
    A series of aryl imines have been synthesized by Fly-ash: PTS catalyzed microwave assisted oxidative coupling of amines and aldehydes under solvent-free conditions. The yield of the imines has been found to be more than 90 %. The purity of all imines has been checked using their physical constants and spectral data as published earlier in literature. The UV ?maxC=N(nm), infrared ?C=N(cm-1), NMR ?(ppm) of CH=N and C=N 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 imines have been studied using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 6; 77-90
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, spectral correlations and antimicrobial activities of some 2-hydroxyphenyl-styrylketone
    Autorzy:
    Sathiyamoorthi, K.
    Mala, V.
    Suresh, R.
    Sakthinathan, S.P.
    Kamalakkannan, D.
    Ranganathan, K.
    Arulkumaran, R.
    Sundararajan, R.
    Vijayakumar, S.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411660.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    solvent-free synthesis
    SiO2-H3PO4
    2’-hydroxyphenylchalcones
    UV
    IR
    NMR spectra
    Opis:
    Some 2’-hydroxyphenylchalcones have been synthesized under microwave irradiation by Claisen-Schmidt condensation between substituted 2-hydroxyacetophenone and substituted benzaldehydes using catalytic amount of SiO2-H3PO4. These chalcones were established by their physical constants and spectroscopic data published earlier. The UV, IR, 1H NMR and 13C NMR spectral data of these chalcone have correlated with Hammett substituent constants, F and R parameters. All the compounds have been subjected to screened for antimicrobial activity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 7, 2; 102-119
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave assisted synthesis, spectral studies and antimicrobial activities of some 2′,4′-difluorophenyl chalcones
    Autorzy:
    Vijayakumar, S.
    Arulkumaran, R.
    Sundararajan, R.
    Sakthinathan, S. P.
    Suresh, R.
    Kamalakkannan, D.
    Ranganathan, K.
    Sathiyamoorthy, K.
    Mala, V.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412217.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Microwave irradiation
    Aldol condensation
    Hydroxyapatite
    Spectral correlations
    Hammett σ constants
    antimicrobial activities
    Opis:
    Some 2′,4′-difluorophenyl chalcones have been synthesized under microwave irradiation using aldol condensation between 2,4-difluoroacetophenone and substituted benzaldehydes using catalytic amount of hydroxyapatite. The yields of the chalcones are more than 85 %. The purities of these synthesized chalcones were examined by their physical constants and spectroscopic data. The UV absorption maxima (λmax, nm), infrared stretches (ν, cm-1) of CO, fingerprint region of CHip/op, CH=CHop, C=Cop modes, NMR chemical shifts (δ, ppm) of vinyl proton, carbon and carbonyl carbons have been assigned and correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the statistical analysis the effect of substituent on the above spectral frequencies can be discussed. The antimicrobial activities of these synthesized chalcones have been screened using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 68-86
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlation analysis and antimicrobial activities of some 2,4-dimethoxy phenyl chalcones
    Autorzy:
    Joseph, S. J.
    Arulkumaran, R.
    Kamalakkannan, D.
    Sakthinathan, S. P.
    Sundararajan, R.
    Suresh, R.
    Vijayakumar, S.
    Ranganathan, K.
    Kalyanasundaram, N.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412661.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 2
    4-dimethoxy phenyl ketones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    A series of 2,4-dimethoxy phenyl chalcones have been synthesized by Crossed-Aldol condensation of 2,4-dimethoxy phenyl and various substituted benzaldehydes. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effects of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 4; 48-65
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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