Studies of homogeneous interactions of N-acetyl-N′-methyl-l-α-amino acid amides in water at 298.15K

Interactions between Sulpha Drugs and Magnesium Chloride in Aqueous Solutions at T = (288.15 to 318.15) K: Volumetric and Viscometric Approach

“…Positive values for V AB show the presence of solvophilic-ionic interactions between sulpha drugs and magnesium chloride while negative values for V ABB give some indication about the presence of solvophobic–ionic interactions between sulpha drugs and ions of magnesium chloride. It may be noted as the higher orders coefficients contain the contributions from the lower order coefficients therefore their interpretation is very difficult. The comparisons of the results show that the dominance of solvophilic–ionic interactions occurs in the case of magnesium chloride as compared to the case of sodium chloride …”

Volumetric studies on nucleic acid bases and nucleosides in aqueous guanidine hydrochloride solutions at T=(288.15 to 318.15)K and at atmospheric pressure

“…V ABB contain contributions from the lower order coefficients also i.e. V AB [36] due to which it becomes difficult to interpret the specificity of the various interactions occurring in these systems. For uracil, thymine, uridine and thymidine the negative values of V AB and its higher magnitude compared to V ABB , shows the dominance of (solvophobic + ionic) interactions.…”

The enthalpies of solution of some dipeptides in aqueous urea mixtures at T=298.15K

“…This probably indicates a lower than expected contribution made by the hydroxyl groups to the global effect described by the enthalpic coefficient, h GlySer-U . This behaviour seems to be due to the involvement of hydroxyl group of the interacting molecules of glycyl-L-serine dipeptide in the intermolecular bond with the adjacent carbonyl group of peptide bond similarly as in the case of N-acetyl-N 0 -methyl-La-serine amide [23][24][25]. Consequently, the hydroxyl group of glycyl-L-serine does not interact fully as a donor with urea molecule as in the case of L-a-serine (Ser) molecules [19].…”