caa a22 4500 469059796 CHVBK 20180323132853.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01053635 doi (NATIONALLICENCE)springer-10.1007/BF01053635 NMR and potentiometric determination of the high p K values and protonation sequence of dipyridino-hexaaza-28-crown-8 and its interactions with selenate, sulfate and nitrate ions in aqueous solution [Elektronische Daten] [G. Wu, R. Izatt, M. Bruening, W. Jiang, H. Azab, K. Krakowiak, J. Bradshaw] The aqueous protonation and anion-binding SeO 2 −/4 SO 2− 4 , and NO − 3 ) constants of the macrocyclic polyamine ligand, dipyridino-hexaaza-28-crown-8(L), were measured in 0.1M KCl using a potentiometric titration technique. The protonation sequence of the aza groups of L was studied in D2O from the chemical shifts of the nonlabile protons so as to find the charge distribution geometry as a function of pD. The study indicates that in 0.1M KC1 fully protonated L forms stable l: 1 complexes with SeO 2− 4 (logK=3.68) and SO 2− 4 (logK=3.55), but not with NO − 3 (logK < l.5). All of the amine pK values were above 6.3, thus allowing the use of the protonated form of this ligand over a wide pH range. Kluwer Academic Publishers, 1992 Macrocyclic polyamine nationallicence inorganic oxa-anions nationallicence equilibrium constants nationallicence protonation sequence nationallicence NMR pH-titration nationallicence Wu G. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Izatt R. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Bruening M. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Jiang W. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Azab H. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Krakowiak K. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Bradshaw J. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 13/2(1992-06-01), 121-127 0923-0750 13:2<121 1992 13 10847 https://doi.org/10.1007/BF01053635 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01053635 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu G. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Izatt R. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Bruening M. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Jiang W. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Azab H. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Krakowiak K. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 700 1- Bradshaw J. Department of Chemistry, Brigham Young University, Provo, 84602, Utah, USA aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 13/2(1992-06-01), 121-127 0923-0750 13:2<121 1992 13 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer