Askin, MuzafferZengin, BilginKorunur, SibelKor, HarunKoylu, M. Zafer2024-04-242024-04-2420171990-79311990-7923https://doi.org/10.1134/S1990793117030162https://hdl.handle.net/11468/17778The 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 H-1 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.eninfo:eu-repo/semantics/closedAccessNmrCrown EthersChemical ShiftsT-1 Relaxation TimeBinding ConstantsArticle113391394WOS:0004054917000022-s2.0-8502377197610.1134/S1990793117030162Q3Q4