Studies in partial molar volumes, partial molar compressibilities and viscosity B-coefficients of caffeine in water at four temperatures

2000 ◽  
Vol 85 (3) ◽  
pp. 361-373 ◽  
Author(s):  
D.V. Jahagirdar ◽  
B.R. Arbad ◽  
A.A. Walvekar ◽  
A.G. Shankarwar ◽  
M.K. Lande
2014 ◽  
Vol 79 (2) ◽  
pp. 225-239 ◽  
Author(s):  
Dhiraj Brahman ◽  
Biswajit Sinha

In this study partial molar volumes (?V0) and viscosity B-coefficients of iron(III)-N, N'-ethylene-bis(salicylideneiminato)-chloride, abbreviated as FeIII(salen)Cl, in different aqueous methanol solutions were determined from solution density and viscosity measurements at temperatures 298.15, 303.15, and 313.15 K under ambient pressure. Apparent molar volumes (?V) and densities (?) were used to calculate the apparent molar expansibilities (?E), the partial molar expansibilities (?E0) and the temperature dependence of the partial molar expansibilities (?E0) at constant pressure, (??E0/?T)P of FeIII(salen)Cl solutions to reveal the nature of different interactions in the ternary solutions. The transition state theory was applied to analyze the viscosity B-coefficients on the basis of the activation parameters of viscous flow. The overall results indicated strong solute-solvent interactions between FeIII(salen)Cl and the solvent molecules, preferentially with water molecules and that FeIII(salen)Cl acts as a net structure promoter in the ternary solutions. UV-VIS absorption spectra of the ternary solutions also stand in support of the results obtained.


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