Abstract
The current study involves the measurements of T 1 relaxation time of complexes three different crown ethers (4-aminobenzo-15-Crown-5, 1-Aza-18-Crown-6, 1-Aza-15-Crown-5) and two different ions sodium perchlorate (NaClO4), lithium perchlorate (LiClO4) by a 400 MHz NMR spectrometer. The association constants (K a) of the complexes were determined on the basis of the evaluation of these measurements using the Benesi-Hildebrand method that we have modified. These association constants were consistent with those obtained from 1H NMR titration technique. As a result, it can be speculated that binding constants could be measured using T 1 relaxation time when chemical shifts are very small or cannot be observed.
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Aşkin, M., Zengin, B., Korunur, S. et al. The examination of a variety of different ions added to the crown ether derivatives with high field NMR spectrometer. Russ. J. Phys. Chem. B 11, 391–394 (2017). https://doi.org/10.1134/S1990793117030162
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DOI: https://doi.org/10.1134/S1990793117030162