caa a22 4500 469059346 CHVBK 20180323132852.0 cr unu---uuuuu 170328e19920501xx s 000 0 eng 10.1007/BF01076667 doi (NATIONALLICENCE)springer-10.1007/BF01076667 A thermodynamic and structural study of the interactions of pyridino- and diketopyridino-18-crown-6 ligands with some primary organic ammonium cations [Elektronische Daten] [C. Zhu, R. Izatt, J. Bradshaw, N. Dalley] Equilibrium constant (K), enthalpy change (ΔH), and entropy change (ΔS) values have been determined calorimetrically at 25°C in 90%MeOH 10%H2O (v/v) for the interactions of pyridino-18-crown-6 (P18C6) and diketopyridino-18-crown-6 (K2P18C6) with perchlorate salts of ammonium, benzylammonium,α-phenylethylammonium,β-phenylethylammonium, andα-(1-naphthyl)ethyl-ammonium cations. The crystal structure of the complex of P18C6 with benzylammonium perchlorate was determined by X-ray crystallography. The1H 1D and 2D NMR spectra of some of these complexes were used to elucidate their structural features in solution. The logK values for the interaction of the ammonium cations with P18C6 are larger than those with K2P18C6, probably due to the higher degree of structural flexibility of P18C6. Ligand K2P18C6 displays appreciable π-π interaction with theα-(1-naphthyl)ethylammonium cation, but not with theα-phenylethylammonium cation. Kluwer Academic Publishers, 1992 Crown ether-primary ammonium cation complexation nationallicence formation constants ( K ) nationallicence enthalpy changes (Δ H ) nationallicence entropy changes (Δ S ) nationallicence titration calorimetry nationallicence Zhu C. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut Izatt R. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut Bradshaw J. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut Dalley N. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 13/1(1992-05-01), 17-27 0923-0750 13:1<17 1992 13 10847 https://doi.org/10.1007/BF01076667 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01076667 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhu C. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut NATIONALLICENCE 700 1- Izatt R. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut NATIONALLICENCE 700 1- Bradshaw J. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut NATIONALLICENCE 700 1- Dalley N. Department of Chemistry, Brigham Young University, Utah 84602, Provo, USA aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 13/1(1992-05-01), 17-27 0923-0750 13:1<17 1992 13 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer