26901-97-3Relevant articles and documents
Chemical Structure and Thermodynamics of Amphiphile Solutions. 1. Solubility of Alkylthiooligooxyethylene Glycols in Water
Sokolowski, Adam
, p. 8223 - 8226 (2007/10/02)
Solubilities of individual alkylthiooligooxyethylene glycols CnH2n+1SCH2CH2(OCH2CH2)zOH (alkyl: n-C4H9, ..., n-C9H19; and z = 0, ..., 3) in water at 298.15 K have been determined.A quantitative correlation has been found between the standard free energy for transfer from aqueous solution to pure liquid phase, ΔGot, and the structure of the studied sulfides and of oligooxyethylenated alcohols as well by using the appropriate multiple regression equation.It has been found that the thioethylene group, -SCH2CH2-, is hydrophobic.The standard free energy contribution, ΔGot, is -3.4 kJ mol-1.The interaction between methylene groups, -CH2-, of the hydrocarbon chain and the -OCH2CH2- groups of the oligooxyethylene chain is statistically significant and has an influence on the total value of ΔGot.Furthermore, the ΔGot and ΔGot are not constant.For the sulfides studied, ΔGot increases linearly with hydrocarbon chain length.For example, ΔGot for the series of butyl and nonyl derivatives is +0.24 and +0.81 kJ mol-1, respectively.The ΔGot for the series of alkyl-2-hydroxyethyl sulfides (z=0) and alkylthiotetraoxyethylene glycol (z=3) is -3.43 and -3.10 kJ mol-1, and the ΔGot and ΔGot for the group of oxyethylenated alcohols are +0.53 and -3.13 kJ mol-1, respectively.
