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Wyświetlanie 1-15 z 48
Tytuł:
Solvent extraction and spectrophotometric determination of Uranium (VI) using 2,2′-[1,2-phenylenebis(nitrilomethylidene)]bisphenol (BSOPD) as an analytical reagent
Autorzy:
Sebastian, S.
Singare, P.U.
Lokhande, R.S.
Powiązania:
https://bibliotekanauki.pl/articles/412353.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Uranium (VI)
solvent extraction-spectrophotometric determination
monazite sand
2,2’-[1,2-phenylenebis(nitrilomethylidene)]bisphenol (BSOPD)
Opis:
2,2'-[1,2-phenylenebis(nitrilomethylidene)]bisphenol (BSOPD) is synthesized in the laboratory and characterized by NMR, IR and elemental analysis for its purity. This reagent forms a yellow complex with U(VI) which can be quantitatively extracted into chloroform at pH 10. This complex in chloroform shows an intense absorption peak at 413.0 nm. It is observed that Beer’s law is obeyed in the range of 2.0-10.0 ppm of metal solution. It gives a linear and reproducible graph under appropriate conditions, the complex having a molar absorptivity of 3.69 x 104 L mol-1·cm-1. Sandell’s sensitivity calculated was found to be 4.4 x 10-3 μg·cm-2. Nature of the extracted complex, determined by Job’s continuous variation method, Slope ratio method and Mole ratio method shows that the composition of U(VI) : BSOPD complex is 1:4. Interference by various ions is studied and masking agents used where required. The proposed method has been applied for the determination of U (VI) in monazite sand and synthetic samples. The results of the analysis are found to be comparable with those obtained by standard method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 2; 125-133
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of some new Schiff bases of 2-oxonaphtho[2,1-b][1,4]oxazine
Autorzy:
Chovatiya, P.
Mehta, C.
Senjani, H.
Shah, A.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/411737.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-Oxonaphtho[2,1-b][1,4]oxazine
Schiff base
Opis:
The literature review reveal that [1,4]-oxazine derivatives represent one of the most active classes of compounds possessing wide spectrum of biodynamic activities and use as potent therapeutic agents. In the present work, a series of Schiff base of 2-(2,3-dihydro-2-oxonaphtho[2,1-b][1,4]oxazin-1-yl)acetohydrazide, 5a-5j has been synthesized using 1-aminonaphthalen-2-ol. Various aromatic aldehyde were react with carbohydrazide 4 in the presence of acid to produce the 2-oxonaphtho[2,1-b][1,4]oxazin Schiff base derivatives with good yields. All synthesized compounds were characterized by IR, NMR and Mass spectrometry analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 12; 26-30
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural, Morphological and Optical Characterization of SnO2:F thin films prepared by Chemical spray Pyrolysis
Autorzy:
Yousif, S. A.
Abass, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/412231.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
SnO2
SnO2:F
X-ray diffraction
optical characterization
Opis:
Fluorine doped tin oxide (FTO) films were successfully prepared on glass and quartz substrate at a substrate temperature equal to for different fluorine doping (0, 0.05, 0.1, 0.15) by a homemade spray pyrolysis technique. The spray solution prepared from tin tetrachloride pentahydrate dissolved in distilled water at concentration and ammonium fluoride was added into the solution for fluorine doping. X-ray diffraction patterns of the spray-deposited (SnO2: F) films for different fluorine doping show that all the diffractograms contain the characteristic SnO2 orientations. The matching of the observed and standard d-values confirm that the deposited films are of tin oxide with tetragonal structure and the films are polycrystalline with (110) as a preferred growth orientation. The surface morphology of thin film has been examined by atomic force microscopy (AFM). The average transmittance in the visible region (at 550 nm) has been found (40 %, 47 %, 52 %, 59 %, 61 %) for the fluorine doping (0, 0.05, 0.1, 0.15, 0.2) respectively.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 13; 90-102
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Receiving and the capacitive profile of the capacitors arrangements on the base of natural rubber with the addition of SrCl2 or ZnCl2 and the active carbon
Autorzy:
Borowski, J.
Borowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/411569.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
natural rubber (NR)
organic capacitors
conductive polymers
SrCl2, ZnCl2
Opis:
In an easy way presented, how to receive cheap capacitive materials with changeable capacitance depending on demand. The examination of capacitive properties /characteristics/ has been determined in temperature of 20 °C. Average range of the capacitance oscillated between 23 and 41 F/g. The capacitive arrangements were marked on the arrangements with resistors and the decades capacitors.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 4; 9-14
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and antimicrobial screening of some new pyrimido[1,2-a]benzimidazole derivatives
Autorzy:
Shah, N. M.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/411967.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-aminobenzimidazole
pyrimido[1,2-a]benzimidazole
chalcone
antimicrobial activity azoloazine
Opis:
Some new pyrimido[1,2-a]benzimidazole derivatives were synthesized by reacting 2-amino benzimidazole and chalcones in n-butanol at reflux temperature. In our present study we have used various heterocyclic chalcones derived from furfural and substituted acetophenones. All synthesized compounds were characterized by IR, 1H NMR and Mass spectroscopy. All synthesized compounds were screened for their antimicrobial activity against gram positive and gram negative bacteria which showed moderate to good activity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 56-60
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Receiving and the capacitive profile of the capacitors arrangements on the base of butadienestyrene rubber with the addition of CuCl2 or ZnCl2 and the active carbon
Autorzy:
Borowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/411563.pdf
Data publikacji:
2012
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
polimery organiczne
kondensatory przewodzące
SBR
CuCl2
ZnCl2
organic capacitors
conductive polymers
Opis:
In an easy way presented, how to receive cheap capacitive materials with changeable capacitance depending on demand. The examination of capacitive properties has been determined in temperature of 20 °C. Average range of the capacitance oscillated between 1 and 9 F/g. The capacitive arrangements were marked on the arrangements with resistors and the decades capacitors.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2012, 2; 1-6
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization and antimicrobial activity of 2-azetidinone derivatives of benzimidazoles
Autorzy:
Mehta, P.
Davadra, P.
Pandya, J. R.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/412088.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-azitidinone
benzimidazole
antimicrobial activity
Opis:
Some new 2-azetidinone derivatives possessing benzimidazole nucleus were synthesized and characterized by IR, NMR and mass spectral analysis. All synthesized compounds were screened for antimicrobial activity using cup plate method. All the compounds showed moderate to good antimicrobial activity and anti fungal activity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 81-88
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on spray pyrolised nanostructured SnO2 thin films for H2 gas sensing application
Autorzy:
Bari, R. H.
Patil, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/411918.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Spray Pyrolysis
Nanostructured SnO2
thin films
H2 gas sensor
Microstrain
Electrical conductivity
Opis:
The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrophotometer (EDAX). The information of crystallite size, dislocation density and microstrain is obtained from the full width-at half- maximum (FWHM) of the diffraction peaks. Effect of sprayed deposition temperature on H2 gas sensing performance and electrical properties were studied using static gas sensing system. The sensor (Tpyr. = 350 °C) showed high gas response (S = 1200 at 350 °C) on exposure of 500 ppm of H2 and high selectivity against other gases The results are discussed and interpreted.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 125-141
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:
Synthesis, characterization and antimicrobial activity of N’-benzylidene-5-bromothiophene-2-carbohydrazide derivatives
Autorzy:
Makwana, H.
Naliapara, Y. T.
Powiązania:
https://bibliotekanauki.pl/articles/411935.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-carbohydrazide
Schiff base
antimicrobial activity
Opis:
Some new N’-benzylidene-5-bromothiophene-2-carbohydrazide derivatives possessing thiophene nucleus were synthesized and characterized by IR, NMR and mass spectral analysis. All synthesized compounds were screened for antimicrobial activity using cup plate method. All the compounds showed moderate to good antimicrobial activity and anti fungal activity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 99-105
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:
Synthesis and Characterization of Novel (E)-1-(aylideneamino)-6-(4-methoxyphenyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridine-3-carbonitrile derivatives
Autorzy:
Khunt, H. R.
Babariya, J. S.
Dedakiya, C. D.
Maniar, C. A.
Naliapara, Y. T.
Powiązania:
https://bibliotekanauki.pl/articles/412535.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
N-amino pyridine
2-cyanoacetohydrazide
1,3-diketone
Opis:
We have described simple facile method for the synthesis of Novel (E)-1-(aylideneamino)-6-(4-methoxyphenyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridine-3-carbonitrile derivatives by using 1,3-diketone as synthon. All the synthesized compounds were characterized by IR, Mass and 1H NMR spectroscopy.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 185-192
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The chemistry and synthesis of 1H-indole-2,3-dione (Isatin) and its derivatives
Autorzy:
Sonawane, R.P.
Tripathi, R.R.
Powiązania:
https://bibliotekanauki.pl/articles/411536.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
indole
isatin
NBS-DMSO
Pfitzinger reaction
5-nitro-1H-indole-2,3-dione
2-methylquinoline-4-carboxylic acid
Opis:
Isatins are synthetically versatile substrates, where they can be used for the synthesis of a large variety of heterocyclic compounds. In this, a convenient method has been developed for the conversion of Indoles into Isatins and some heterocyclic derivative were synthesised such as 5- nitro-1H-indole-2,3-dione, 2-methylquinoline-4-carboxylic acid which may be used as raw material for drug synthesis. The general process utilizes the effective method for synthesis of Isatin from Indole is bromination and oxidation with an N-bromosuccinimide-dimethyl sulfoxide reagent. The nitration of Isatin at C-5 takes place by using KNO3, conc. H2SO4, 2-methylquinoline-4-caboxylic acid are usually obtained from pfitzinger reaction.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 30-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple and Efficient Three Component One-pot Synthesis of Pyrazolo[1,5,a]pyrimidines
Autorzy:
Morabia, A. R.
Naliapara, Y. T.
Powiązania:
https://bibliotekanauki.pl/articles/411804.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Pyrazolopyrimidine
5-amino-N-cyclohexyl-3-(methylthio)-1H-pyrazole-4-carboxamide
1-(2-bromophenyl)-2-nitroethanone
mild reaction condition
Opis:
A series of novel 5-(2-bromophenyl)-N-cyclohexyl-2-(methylthio)-6-nitro-7-phenyl-4,7-dihydropyrazolo[1,5-a]pyrimidine-3-carboxamides were synthesized by a one-pot reaction of 5-amino-N-cyclohexyl-3-(methylthio)-1H-pyrazole-4-carboxamide, 1-(2-bromophenyl)-2-nitroethanone and aryl aldehydes in the presence of boric acid in water at refluxing temperature. Structures of compounds were demonstrated by Fourier transform infrared, 1H NMR, 13C NMR and elemental analysis. The advantages of this method are mild reaction condition, good yields, and operational simplicity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 41; 73-81
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of 1,3,5-trisubstituted pyrazoline derivatives by ultrasonic irradiation method and evaluation of its antibacterial activity
Autorzy:
Raguraman, A.
Santhi, N.
Powiązania:
https://bibliotekanauki.pl/articles/412019.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4-methylacetophenone
ultrasonic irradiation
chalcone
2-pyrazoline
antibacterial
antifungal
Opis:
A series of novel 1,3,5-trisubstituted pyrazoline derivatives (P1-P10) have been synthesized by the reaction of substituted chalcones (C1-C10) with 4-hydroxybenzhydrazide. The starting material, chalcones were prepared by claisen Schmidt condensation of 4-methylacetophenone with substituted aldehydes in the presence of sodium hydroxide in ethanol. 4-hydroxybenzhydrazide was synthesized by condensing methyl 4-hydroxybenzoate with hydrazine hydrate. The cycloaddition of chalcones with 4-hydroxybenzhydrazide gives 1, 3, 5-trisubstituted pyrazoline derivatives. The structures of synthesized derivatives were confirmed by IR, 1HNMR and 13C NMR spectrum. The synthesized compounds were screened for their antibacterial and antifungal activity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 2; 219-233
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 48

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