caa a22 4500 469059184 CHVBK 20180323132852.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01053866 doi (NATIONALLICENCE)springer-10.1007/BF01053866 Influence of solvent properties on cation-macrocycle complexation: Cesium cryptates [Elektronische Daten] [Lee-Lin Soong, George Leroi, Alexander Popov] The chemical shift of the133Cs resonance has been measured as a function of the mole ratio of cryptands C222, C222B, C221, and C211 to the Cs+ ion inN-methylformamide and dimethylacetamide solutions. The overall formation constants of the cesium cryptates were calculated from the NMR titration curves. From these and previously reported data it is clear that solvent properties such as dipole moment, donicity, dielectric constant and hydrogen bonding ability affect macrocyclic ligand-cation complexation equilibria through specific solvation of the cation, the ligand and the complex. A model of M+ · L bonding in solution, involving a rather intimate electrostatic attraction between the cation and the local electron distribution of the macrocycle accompanied by little perturbation of the charge distributions of the separated partners, is presented. In addition to the specific interactions previously noted, the presence of the solvent mitigates the ion-multipole forces which would otherwise govern the long-range attraction. Kluwer Academic Publishers, 1992 Cesium cryptate stabilities nationallicence high dielectric solvents nationallicence 133Cs NMR nationallicence electrostatic nature of complexation nationallicence Soong Lee-Lin Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut Leroi George Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut Popov Alexander Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 12/1-4(1992-01-01), 253-262 0923-0750 12:1-4<253 1992 12 10847 https://doi.org/10.1007/BF01053866 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01053866 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Soong Lee-Lin Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut NATIONALLICENCE 700 1- Leroi George Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut NATIONALLICENCE 700 1- Popov Alexander Department of Chemistry, Michigan State University, 48824-1322, East Lansing, MI, USA aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 12/1-4(1992-01-01), 253-262 0923-0750 12:1-4<253 1992 12 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer