Anwar Ali - Academia.edu (original) (raw)
Papers by Anwar Ali
Journal of Saudi Chemical Society, 2017
Ultrasonic speed, u and density, q have been measured for DL-alanine (Ala) and L-phenylalanine (P... more Ultrasonic speed, u and density, q have been measured for DL-alanine (Ala) and L-phenylalanine (Phe) in aqueous b-cyclodextrin (b-CD) at 298.15, 303.15, 308.15, and 313.15 K. The complexation of Ala and Phe with b-CD has been studied by means of UV-vis and thermodynamic (ultrasonic speed and density) studies. Using the measured ultrasonic speed and density data the apparent molar compressibility (j S,u), apparent molar volume (V u), limiting apparent molar compressibility (j 0 S;u), limiting apparent molar volume (V 0 u), their constants (S K and S v), and hydration number (n H) have been obtained. The positive values of transfer properties at infinite dilution for Ala and Phe in b-CD is the outcome of the balance between released water molecules from b-CD cavity and hydrophobic groups of Ala and Phe that enter into the macrocycle b-CD cavity. The experimental results have also been discussed on the basis of UV-vis absorbance. The results indicate the formation of a more stable host-guest complex between Phe-b-CD than between Ala-b-CD.
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](Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
h i g h l i g h t s Unusual behaviour of Richardt dye 33. Unusual behaviour of KAT parameters. IL... more h i g h l i g h t s Unusual behaviour of Richardt dye 33. Unusual behaviour of KAT parameters. IL + PEG-400 mixtures as favourable media.
Physics and Chemistry of Liquids, 2008
Journal of Molecular Liquids, 2013
ABSTRACT
Journal of Dispersion Science and Technology, 2010
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of Chemical Research, 2006
Internal pressures of a number of binary liquid mixtures of varying natures of component liquids ... more Internal pressures of a number of binary liquid mixtures of varying natures of component liquids have been predicted using Flory's statistical theory. The predicted values have been compared with the experimentally calculated ones. Good approximation has been observed.
Green Chemistry, 2007
Limitations of the properties of water, the most common green solvent, may be overcome by adding ... more Limitations of the properties of water, the most common green solvent, may be overcome by adding small amounts of ionic liquids (ILs). Important physical properties, such as density, viscosity and refractive index, of dilute aqueous IL 1-butyl-3-methylimidazolium hexafluorophosphate ( ...
Chinese Journal of Chemistry, 2008
ABSTRACT The densities (ρ), viscosities (η), refractive indices (n D), and speeds of sound (u), o... more ABSTRACT The densities (ρ), viscosities (η), refractive indices (n D), and speeds of sound (u), of binary mixtures of pyridine with 1-hexanol, 1-heptanol, 1-octanol and 1-decanol, including those of pure liquids, were measured over the entire composition range at 303.15 K and atmospheric pressure. From these experimental data, the values of excess molar volumes (V E), deviations in isentropic compressibilities (∆k s), viscosities (∆η), molar refractions (∆R m), apparent and partial molar volumes (V φ,2 and 0 ,2 V φ), apparent and partial molar compressibilities (K φ,2 and 0 ,2 K φ), of alkanols in pyridine and their corresponding deviations (∆V and ∆K) were calculated. The variations of these parameters with composition of the mixtures suggest that the strength of interactions in these mixtures follow the order: 1-hexanol＞1-heptanol＞1-octanol＞1-decanol. All the excess and deviation functions were fitted to Redlich-Kister polynomial equation to determine the fitting coefficients and the standard deviations.
Journal of Saudi Chemical Society, 2017
Ultrasonic speed, u and density, q have been measured for DL-alanine (Ala) and L-phenylalanine (P... more Ultrasonic speed, u and density, q have been measured for DL-alanine (Ala) and L-phenylalanine (Phe) in aqueous b-cyclodextrin (b-CD) at 298.15, 303.15, 308.15, and 313.15 K. The complexation of Ala and Phe with b-CD has been studied by means of UV-vis and thermodynamic (ultrasonic speed and density) studies. Using the measured ultrasonic speed and density data the apparent molar compressibility (j S,u), apparent molar volume (V u), limiting apparent molar compressibility (j 0 S;u), limiting apparent molar volume (V 0 u), their constants (S K and S v), and hydration number (n H) have been obtained. The positive values of transfer properties at infinite dilution for Ala and Phe in b-CD is the outcome of the balance between released water molecules from b-CD cavity and hydrophobic groups of Ala and Phe that enter into the macrocycle b-CD cavity. The experimental results have also been discussed on the basis of UV-vis absorbance. The results indicate the formation of a more stable host-guest complex between Phe-b-CD than between Ala-b-CD.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
h i g h l i g h t s Unusual behaviour of Richardt dye 33. Unusual behaviour of KAT parameters. IL... more h i g h l i g h t s Unusual behaviour of Richardt dye 33. Unusual behaviour of KAT parameters. IL + PEG-400 mixtures as favourable media.
Physics and Chemistry of Liquids, 2008
Journal of Molecular Liquids, 2013
ABSTRACT
Journal of Dispersion Science and Technology, 2010
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Journal of Chemical Research, 2006
Internal pressures of a number of binary liquid mixtures of varying natures of component liquids ... more Internal pressures of a number of binary liquid mixtures of varying natures of component liquids have been predicted using Flory's statistical theory. The predicted values have been compared with the experimentally calculated ones. Good approximation has been observed.
Green Chemistry, 2007
Limitations of the properties of water, the most common green solvent, may be overcome by adding ... more Limitations of the properties of water, the most common green solvent, may be overcome by adding small amounts of ionic liquids (ILs). Important physical properties, such as density, viscosity and refractive index, of dilute aqueous IL 1-butyl-3-methylimidazolium hexafluorophosphate ( ...
Chinese Journal of Chemistry, 2008
ABSTRACT The densities (ρ), viscosities (η), refractive indices (n D), and speeds of sound (u), o... more ABSTRACT The densities (ρ), viscosities (η), refractive indices (n D), and speeds of sound (u), of binary mixtures of pyridine with 1-hexanol, 1-heptanol, 1-octanol and 1-decanol, including those of pure liquids, were measured over the entire composition range at 303.15 K and atmospheric pressure. From these experimental data, the values of excess molar volumes (V E), deviations in isentropic compressibilities (∆k s), viscosities (∆η), molar refractions (∆R m), apparent and partial molar volumes (V φ,2 and 0 ,2 V φ), apparent and partial molar compressibilities (K φ,2 and 0 ,2 K φ), of alkanols in pyridine and their corresponding deviations (∆V and ∆K) were calculated. The variations of these parameters with composition of the mixtures suggest that the strength of interactions in these mixtures follow the order: 1-hexanol＞1-heptanol＞1-octanol＞1-decanol. All the excess and deviation functions were fitted to Redlich-Kister polynomial equation to determine the fitting coefficients and the standard deviations.