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1
Content available remote Thermal Analysis of some Imidazolinone Derivatives
Baluja S., Kachhadia N.
International Letters of Chemistry, Physics and Astronomy
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2015
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Vol. 44
124--129
EN
Thermal analysis of some imidazolinone derivatives derived from 1, N-phenyl-3-p-nitrophenyl-4-formyl pyrazole, have been carried out by TGA technique. From these thermograms, various kinetic parameters such as order of degradation (n), energy of activation (E), frequency factor (A) and entropy change (∆S) have been evaluated. Further, thermal stability of imidazolinone derivatives have been determined, which is found to depend on the type of substituent present in the compounds.
2
Content available remote Dissociation Constants of Some Quinoline Derivatives in Mixed Solvent mixture
Baluja S.
International Letters of Chemistry, Physics and Astronomy
|
2015
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Vol. 48
32--36
EN
The dissociation constants of some derivatives of quinoline have been determined by Calvin Bjerrum pH titration method in DMF–water (60:40 v/v) mixture at 308.15 K. It is observed that dissociation constant depends on the substituents present in the compound.
3
Content available remote Acoustical Studies of some Chalcones in DMF and DMSO Solutions
Baluja S., Kasundra P.
International Letters of Chemistry, Physics and Astronomy
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2015
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Vol. 44
130--140
EN
This work reports densities, speeds of sound, and isentropic compressibility of the solutions of some synthesized chalcones in N,N-dimethylformamide and dimethyl sulphoxide solutions of various concentrations at 308.15 K with a view to understand molecular interactions in these solutions.
4
Content available Synthesis, characterization and antimicrobial activity of some new dihydropyrano[c]chromenes
Bhalu A., Moteriya P., Chanda S., Baluja S.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 12
1--6
EN
Some new dihydropyrano[c]chromenes derivatives are synthesized from 4-hydroxycoumarin. The structure of newly synthesized compounds was confirmed by mass, 1H NMR and IR spectroscopy. Further, antimicrobial screening of these synthesized compounds was done against some bacterial (Gram positive as well as Gram negative) and fungal strains in N,N-dimethylformamide. It is observed that some of synthesized compounds exhibited significant antibacterial activity against Gram positive bacterial strains. The selected fungal strains were most resistant for the studied compounds as none of the synthesized compounds showed activity against any of the fungal strain studied. The best antibacterial activity was shown by ABR-10.
5
Content available Solubility of butylated hydroxytoluene (BHT) in aqueous and alcohol sulutions from 293.15 to 313.15 K
Baluja S., Bhesaniya K., Bhalodia R., Chanda S.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 9
48--58
EN
The solubility of Butylated hydroxyl toluene in aqueous and alcohol solutions were determined at different temperatures (293.15 to 313.15) K. Using Van’t Hoff and Gibb’s equations, some thermodynamic functions such as Gibbs energy, enthalpy and entropy of dissolution, and of mixing of Butylated hydroxyl toluene in aqueous and alcohol solutions, were evaluated from solubility data. The solubility was greater in butanol and minimum in water. The enthalpies, entropy and Gibb’s energy of dissolution were positive for all solvents.
6
Content available Acoustical studies of some derivatives of 1,5-benzodiazepines at 298.15 K
Baluja S., Godvani N.
International Letters of Chemistry, Physics and Astronomy
|
2014
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Vol. 19, iss. 2
132--142
EN
Some new derivatives of 1,5-Benzodiazepines have been synthesized and their structural characterizations are done by IR, NMR and Mass Spectral data. The ultrasonic velocity, density and viscosity of these synthesized compounds have been measured in dimethyl formamide and tetrahydrofuran at 298.15 K. From these experimental data, some acoustical parameters such as isentropic compressibility, intermolecular free path length, Rao’s molar sound function, relaxation strength, solvation number etc., have been calculated which helps in understanding the molecular interactions occurring in these solutions.
7
Content available Solubility of a pharmacological intermediate drug Isatin in different solvents at various temperatures
Baluja S., Bhalodia R., Bhatt M., Vekariya N., Gajera R.
International Letters of Chemistry, Physics and Astronomy
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2013
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Vol. 12
36--46
EN
The solubility of isatin in different solvents was studied by a gravimetrical method from (298.15 to 318.15) K under atmospheric pressure and the solubility data were correlated against temperature. The solvents selected for the present study are: water, methanol, ethanol, 1-butanol, dichloromethane, dichloroethane, chloroform and carbon tetra chloride. Among chlorinated solvents, solubility is observed to be maximum in 1, 2-dichloroethane and minimum in dichloromethane whereas in alcohols, maximum solubility is observed in methanol. In water, solubility is found to be minimum. Further, some thermodynamic parameters such as Gibb’s energy (ΔGsol), heat of solution (ΔHsol) and entropy of solution (ΔSsol) have also been evaluated.
8
Content available Determination of kinetic parameters of decomposition of tetrahydropyrimidine derivatives
Bhesaniya K., Patel A., Baluja S.
International Letters of Chemistry, Physics and Astronomy
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2013
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Vol. 13
23-32
EN
Some new tetrahydropyrimidine derivatives have been synthesized and their structural determination was done by IR, NMR and mass spectral data. Thermal analysis of these synthesized dihydropyrimidinthiones has been carried out by TGA and DSC techniques. From the thermograms, various kinetic parameters such as order of degradation (n), energy of activation (E), frequency factor (A) and entropy change (ΔS) have been evaluated. Further, thermal stability of tetrahydropyrimidine have been determined which is found to depend on the type of substituent present in the compounds.
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