An investigation of the structure of the mixture acetic acid-cyclohexane by the nuclear magnetic relaxation method

Abstract

Longitudinal relaxation times 7\ of the various protons in the system CH3COOH-C6Hi2 have been measured as a function of mixture composition. From these data intramolecular relaxation rates and intermolecular proton relaxation rates arising from interactions among the proton-carrying groups are extracted. The experimental results have been evaluated to yield orientation dependent model molecular pair distribution functions involving pairs of acid molecules, pairs of cyclohexane molecules, and acid-cyclohexane pairs.

Effect of different sodium halides on the self-association of tertiary butanol in water

“…To use this as a quantification of molecular self-association, we follow the approach of Hertz and co-workers. [25][26][27][28] Assuming that the only protons in the system are those in the TBA molecules, we may describe the molecular distribution by the protonproton pair correlation function g HH ͑r͒. We then consider the weighted integral…”

Adding salt to an aqueous solution of t-butanol: Is hydrophobic association enhanced or reduced?

“…As a measure of the degree of intermolecular association, Hertz and co-workers [40,41,47] introduced a socalled "association parameter A", which is a weighted integral of the pair correlation function of the nuclei contributing to the dipolar relaxation process (in the present case 1 H nuclei in TBA-d1-solutions) and is defined as [48] A = 1 2…”

Nuclear magnetic resonance relaxation study of I– and Na+ solvation structure in N-methylformamide (NMF) and preferential solvation of these ions in the mixture NMF—H2O

“…We shall use the association parameter A , which for equal nuclei is defined9-l3 as and from eqn (10) it follows where c' is the number density of protons. We wish to have the A parameter for unlike particles as well.…”