scholarly journals Density, Viscosity and Ultrasonic Speed Based Acoustical Studies of Structural Properties of 1,1’-Bis(4-Amino Phenyl) Cyclohexane Symmetric Double Schiff Bases in THF Solutions at 303.15, 308.15 and 313.15K

2015 ◽  
Vol 53 ◽  
pp. 19-30
Author(s):  
Bhavesh J. Gangani ◽  
Parsotam H. Parsania
Keyword(s):  
Schiff Bases ◽  
Molecular Interactions ◽  
Path Length ◽  
Free Path Length ◽  
Isentropic Compressibility ◽  
Linear Increase ◽  
Ultrasonic Speed ◽  
Solvent Concentration ◽  
Acoustical Parameters ◽  
Different Temperatures

The density (ρ), viscosity (η) and ultrasonic speed (U) (2MHz) of THF solutions of symmetric double Schiff bases (SDSB-1,SDSB-2 and SDSB-3) were determined at 303.15, 308.15 and 313.15 K. Various acoustical parameters such as specific acoustical impedance (Z), isentropic compressibility (ks), Rao’s molar sound function (Rm), Van der Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free path length (Lf), viscous relaxation time (τ) and classical absorption coefficient (α/f2)Cl), were determined using ρ, η and U data. The results are interpreted in terms of molecular interactions occurring in the solutions at different temperatures and concentrations. Linear increase of ρ, η U, Z, Rm, b, (α/f2)Cl and τ with increasing C, linear decrease of КS, Lf and π with increasing T, Vf increased linearly with C and T except SDSB-3 supported existence of strong molecular interactions in the solutions and confirming solvophilic nature of the Schiff bases. The structure, nature and size of the solutes and solvent, concentration and temperature affected molecular interactions.

scholarly journals Ultrasonic Speed, Density, Viscosity and Associated Acoustical Parameters of Chloroform Solutions of Symmetric Double Schiff Bases at 308.15K

2015 ◽  
Vol 45 ◽  
pp. 16-23
Author(s):  
B.J. Gangani ◽  
Parsotam H. Parsania
Keyword(s):  
Relaxation Time ◽  
Schiff Bases ◽  
Molecular Interactions ◽  
Path Length ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Solvation Number ◽  
Ultrasonic Speed ◽  
Acoustical Parameters ◽  
Nonlinear Trends

The density, viscosity and ultrasonic speed (2MHz) of chloroform and symmetric double Schiff bases have been investigated at 308.15K. Various acoustical parameters such as specific acoustical impedance (Z), adiabatic compressibility (Кa), Rao’s molarsound function (Rm), Vander Waals constant (b), internal pressure (π), free volume (Vf), intermolecular free path length (Lf), classical absorption coefficient (α/f2)Cl) and viscous relaxation time (τ) were determined using ultrasonic speed (U), viscosity (η) and density (ρ) data of Schiff bases solutions and correlated with concentration. Increasing linear or nonlinear trends of (Z, Rm, b, τ and (α/f2)Cl) and decreasing trend of Кa, Lf,, π and Vf with increasing concentration of Schiff bases suggested presence of strong molecular interactions in the solutions and solvophilic nature of the Schiff bases, which is further supported by the positive values of solvation number. The nature and position of substituent also affected the strength of molecular interactions.

scholarly journals Thermo-Acoustical Study of Biologically Active 1,1’-Bis(3-Methyl-4-Carboxyethylphenoxy) Cyclohexane at Four Different Temperatures

2015 ◽  
Vol 47 ◽  
pp. 1-14 ◽  
Author(s):  
Bhavin. B. Dhaduk ◽  
Parsotam H. Parsania
Keyword(s):  
Molecular Interactions ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Linear Increase ◽  
Biologically Active ◽  
Acoustical Parameters ◽  
Free Energy Of Activation ◽  
Different Temperatures ◽  
Entropy Of Activation ◽  
Acoustical Study

Density (ρ), viscosity (η), ultrasonic speed (U), and thermo-acoustical parameters such as specific acoustical impedance (Z), adiabatic compressibility (κa), internal pressure (π), free volume (Vf), inter molecular free path length (Lf), Van der Waals constant (b), viscous relaxation time (τ), classical absorption coefficient (α/f2)cl, Rao’s molar sound function (Rm), solvation number (Sn), Gibbs free energy of activation (ΔG*), enthalpy of activation (ΔH*) and entropy of activation (ΔS*) of biologically active 1,1’-bis (3-methyl-4-carboxyethylphenoxy) cyclohexane (BMCPC) in 1,4-dioxane (DO), ethyl acetate (EA), tetrahydrofuran (THF) have been studied at four different temperatures: 298, 303, 308 and 313 K to understand the molecular interactions in the solutions. A good to excellent correlation between a given parameter and concentration is observed at all temperatures and solvent systems studied. Linear increase or decrease [except (α/f2)cl ] of acoustical parameters with concentration and temperature indicated the existence of strong molecular interactions. ΔG* decreased linearly with increasing concentration and temperature in DO and EA systems and increased with temperature in THF system. ΔH* and ΔS* are found practically concentration independent in case of DO and EA system but both are found concentration dependent in THF system.

scholarly journals Intermolecular Interaction of Aqueous Dextran with Urea

2019 ◽  
Vol 8 (11) ◽  
pp. 742-748
Keyword(s):  
Isentropic Compressibility ◽  
Structural Rearrangement ◽  
Urea Solution ◽  
Ultrasonic Speed ◽  
Acoustical Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Gibb’S Free Energy ◽  
Dextran Solution ◽  
Aqueous Dextran

In this paper, the authors have given information regarding intermolecular interactions of aqueous dextran solution in urea. The behavior of dextran in urea has been examined by the help of ultrasonic interferometer working at frequency 5MHz at different temperatures ranging from 303 K to 323 K in 5K interval. Ultrasonic speed, density, viscosity measurements have been used for the evaluation of thermodynamic parameters like Gibb’s free energy (ΔG) as well as acoustical parameters are acoustic impedance (Z), isentropic compressibility (β), intermolecular free length (Lf ) and relaxation time (τ), etc. The results have been used to throw light on the nature of the interaction among solute and solvent, interpreted in the light of structural rearrangement occurs in the aqueous dextran and urea solution.

scholarly journals Ultrasonic Speed and Related Acoustical Parameters of 1,1ʼ-Binaphthalene-2,2ʼ-diyl Diacetate Solutions at 308.15 K

2011 ◽  
Vol 8 (2) ◽  
pp. 762-766
Author(s):  
Pooja P. Adroja ◽  
S. P. Gami ◽  
J. P. Patel ◽  
P. H. Parsania
Keyword(s):  
Adiabatic Compressibility ◽  
Linear Increase ◽  
Solvation Number ◽  
Ultrasonic Speed ◽  
Excellent Correlation ◽  
Acoustical Parameters ◽  
Free Energy Of Activation ◽  
Solvent Systems ◽  
Alcohol Ethyl ◽  
Nonlinear Increase

The density (ρ), viscosity (η) and ultrasonic speed (U) (2 MHz) of chloroform, THF, ethyl alcohol, ethyl acetate, 1,4-dioxane and 1,1ʼ-binaphthalene-2,2ʼ-diyl diacetate (DBNA) solutions have been determined at 308.15 K. Various acoustical parameters namely specific acoustical impedance (Z), adiabatic compressibility (κa), Van der Waals constant (b), intermolecular path length (Lf), internal pressure (π), Raoʼs molar sound function (R), relaxation time (τ), classical absorption coefficient (α/f2)cland solvation number (Sn) have been derived from ρ, η and U data and correlated with concentration (C). A fairly good to excellent correlation has been observed between a particular parameter and C. Linear increase of Z, R, b, (α/f2)cland τ (except EA) (R2= 0.90 – 0.999) and linear decrease of κs, π and Lf(R2= 0.947 – 0.995) with C supported existence of powerful molecular interactions in the solutions and further supported by nonlinear increase of Snwith C. A fairly constant Gibbs free energy of activation has been observed in all the solvent systems studied.

scholarly journals Study of Acoustical Parameters in Binary Liquid Mixture Containing 1-Butanol and Hexane at Temperatures 313.15 K, 318.15 K and 323.15 K

2013 ◽  
Vol 18 ◽  
pp. 1-7
Author(s):  
C.H. Srinivasu ◽  
K. Anil Kumar ◽  
S.K. Fakruddin ◽  
K. Narendra ◽  
T. Anjaneyulu
Keyword(s):  
Experimental Data ◽  
Molecular Interactions ◽  
Acoustic Impedance ◽  
Entire Range ◽  
Liquid Mixture ◽  
Adiabatic Compressibility ◽  
Binary Liquid Mixture ◽  
Acoustical Parameters ◽  
Binary Liquid ◽  
Different Temperatures

The values of ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), free length (Lf), molar volume (Vm) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.

scholarly journals Acoustical Studies of Binary Liquid Mixtures of p-Chlorotoluene in Benzene at Different Temperatures

2014 ◽  
Vol 29 ◽  
pp. 25-37 ◽  
Author(s):  
G. Pavan Kumar ◽  
Ch. Praveen Babu ◽  
K. Samatha ◽  
A.N. Jyosthna ◽  
K. Showrilu
Keyword(s):  
Molecular Interactions ◽  
Molecular Interaction ◽  
Adiabatic Compressibility ◽  
Liquid Mixtures ◽  
Ultrasonic Velocities ◽  
Acoustical Parameters ◽  
Binary Liquid ◽  
Wada’S Constant ◽  
Rao’S Constant ◽  
Different Temperatures

Ultrasonic velocities (U), densities (ρ), and coefficient of viscosities (η) are measured for binary mixtures containing (i) p-chlorotoluene and (ii) benzene at 303.15 K, 308.15 K, 313.15 K and 318.15 K to understand the molecular interaction. Various acoustical parameters such as adiabatic compressibility (βad), free length (Lf), acoustic impedance (Z), free volume (Vf), molar volume (Vm), Rao’s constant (R), Wada’s constant (W) and internal pressure (πi), are calculated from the measured values of U, ρ, and η. The trend in acoustical parameters also substantiates to asses strong molecular interactions.

scholarly journals Acoustical Studies of Some Derivatives of 1,5-Benzodiazepines at 298.15 K

2014 ◽  
Vol 38 ◽  
pp. 132-142 ◽  
Author(s):  
Shipra Baluja ◽  
Nilesh Godvani
Keyword(s):  
Free Path Length ◽  
Isentropic Compressibility ◽  
Dimethyl Formamide ◽  
Solvation Number ◽  
Mass Spectral Data ◽  
Acoustical Parameters ◽  
Relaxation Strength ◽  
Mass Spectral ◽  
Derivatives Of ◽  
Structural Characterizations

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.

scholarly journals Molecular Interactions of Piperidinium Based Ionic Liquids with Water/Alcohol at Different Temperatures

2020 ◽  
Vol 33 (1) ◽  
pp. 195-202
Author(s):  
G.V. Gangadhara Rao ◽  
Shaik Babu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
Molar Volume ◽  
Molecular Interactions ◽  
Isentropic Compressibility ◽  
Acoustic Parameters ◽  
Fundamental Parameters ◽  
Different Temperatures ◽  
Excess Molar Isentropic Compressibility ◽  
Water Alcohol

In this experimental investigation, the thermodynamic fundamental parameters of density (ρ) and speed of sound(U) were calibrated for aqueous solution/alcoholic (1-propanol and 2-propanol) solutions of piperidinium based ionic liquids of 1-butyl-1-methylpiperidinium tetrafluoroborate (BMPiBF4) in various concentrations within temperatures from 303.15 to 313.15 K. From these experimental determined values, various thermodynamic acoustic parameters of excess molar isentropic compressibility (KE s,m), excess molar volume (VE m) are expressed in specific and non-specific molecular interactions. Moreover, calibration of the partial molar volume′s and partial isentropic compressibility′s of both components shows strong interaction in BMPiBF4 + 2-proponol combination than any other executed binary composites. In addition to this, the FTIR characteristic spectrum of all combinations at different concentrations gives the more promising features such as interaction behaviour that helps our analysis to guide the interactions of individual bonds.

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