Kamlet-Taft. pi. * polarizability/dipolarity of mixtures of water with various organic solvents

Journal Article · Fri Apr 15 04:00:00 EDT 1988 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00159a018· OSTI ID:6977811

Cheong, W J; Carr, P W

The Kamlet-Taft ..pi..* values of mixtures of water with four organic solvents over the entire range of composition have been estimated by solvatochromic measurement with a series of carefully selected indicators. The measured ..pi..* value of each indicator is collinear with the average ..pi..* value. The authors interpret these results as indicating that the indicators sense the polarizability/dipolarity and not the hydrogen bond acidity of the solvent. Examination of relationships between ..pi..* and epsilon and between E/sub T/ and ..pi..* and excess properties of ..pi..*, E/sub T/, and epsilon with respect to volume fraction of the organic cosolvent leads to the conclusion that the principal effect of changing the solvent composition on the observed ..pi..* values operates through the dielectric properties of the local medium about the solute. This also supports the previous observation that solvatochromic shifts of the indicators used in this study are not very sensitive to solvent hydrogen bond acidity. The measured ..pi..* values together with literature E/sub T/ values were used to estimate ..cap alpha.. values, the hydrogen bond acidity parameter, of aqueous organic solvents.

• Research Organization: Univ. of Minnesota, Minneapolis (USA)
• OSTI ID: 6977811
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 60:8; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHEMICAL BONDS
DATA
DIELECTRIC PROPERTIES
DIPOLE MOMENTS
DISPERSIONS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ELECTRICAL PROPERTIES
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
MEASURING METHODS
MIXTURES
NONMETALS
NUMERICAL DATA
ORGANIC SOLVENTS
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POLARIZABILITY
PREDICTION EQUATIONS
SOLUTES
SOLVENTS
WATER