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| Content Provider | PubMed Central |
|---|---|
| Author | Sahai, R. Loper, G. L. Lin, S. H. Eyring, H. |
| Abstract | It has been the purpose of the present paper to investigate and explore the conditions under which the linear relation between Δ/CD 0 and Δ in the Hanna-Ashbaugh-Foster-Fyfe equation for the evaluation of equilibrium constants holds, (CD 0 is initial concentration of a donor and Δ is the observed chemical shift relative to the chemical shift of the acceptor) to obtain the equation representing the exact linear relation between Δ/CD 0 and Δ, when the linear relation between Δ/CD 0 and Δ holds, and to discuss how to use the Job method in nuclear magnetic resonance measurements to determine the stoichiometry of molecular complexes. We have found that the conventional belief that CD 0 should always be chosen to be much greater than CA 0 (initial concentration of acceptor) is not necessarily always true and the exact linear relation between Δ/CD 0 and Δ is represented by the equation Δ/CD 0 = K 1Δ0/(1 + K 1 CA 0) - K 1Δ/(1 + K 1 CA 0)2, where K 1 is the formation constant of the complex. It is shown that in the Job method of nuclear magnetic resonance measurements one has to plot ΔCA 0 against the mole fraction, and the mole fraction at the maximum should give us the composition of the complex. Theoretical results have been verified experimentally on the weak interaction between naphthalene and methyl iodide. |
| Starting Page | 1499 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 71 |
| Language | English |
| Publisher Date | 1974-04-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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