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przez ScienceDirect Publication: Tetrahedron Letters dnia 10-10-10
Publication year: 2010Source: Tetrahedron Letters, In Press, Accepted Manuscript, Available online 10 October 2010
Kristin N., Skala , Katelyn G., Perkins , Amna, Ali , Robert, Kutlik , Addie M., Summitt , ...
A new ion-pair receptor bis(3-bromoindol-2-ylmethyl)(2-pyridylmethyl)amine (1) was synthesized and studied for its anion and cation binding behavior using ESI-MS and 1H NMR spectroscopy. Among halides, 1 exhibits the strongest binding with Cl- to form a 1:1 adduct (Ka = 1042±21 in CD3CN). Among alkali metal ions, Li+ and Na+ showed the strongest binding in the formation of a 1·M+ complex. The simultaneous binding of Cl- and Li+ to 1 was confirmed by 1H NMR titration of a 1:1 mixture of 1 and Cl- with LiPF6 in 83:17 v/v mixture of CDCl3 and DMSO-d6. DFT-optimized structures of 1·Cl-, 1·Li+, and 1·Li+·Cl-...
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