Metal-Enhanced H-Bond Donor Tendencies of Urea and Thiourea toward Anions: Ditopic Receptors for Silver(I) Salts
- 29 October 2005
- journal article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 44 (24) , 8690-8698
- https://doi.org/10.1021/ic050871f
Abstract
The heteroditopic receptors 1 and 2 firmly include an Ag(I) ion into the NS2O2 crown and establish selective H-bond interactions with anions at the covalently linked urea/thiourea (U/T) subunit. Studies in MeCN solution showed that the metal center induces a 10(3)-10(6)-fold enhancement of the anion association constant, due to a coordinative interaction with the O/S atom of the U/T moiety. In the presence of F-, the Ag-O interaction promotes the release of a proton from one of the urea N-H fragments. Ag(I) coordination to the S atom of the thiourea derivative 2 promotes the formation of unusually stable H-bond complexes with Cl- and Br-.Keywords
This publication has 37 references indexed in Scilit:
- Molecular Recognition of Trigonal Oxyanions Using a Ditopic Salt Receptor: Evidence for Anisotropic Shielding Surface around Nitrate AnionJournal of the American Chemical Society, 2005
- Selective Solid−Liquid Extraction of Lithium Halide Salts Using a Ditopic Macrobicyclic ReceptorInorganic Chemistry, 2004
- Conformational and stereochemical flexibility in cadmium(ii) complexes of aza-thioether macrocyclesDalton Transactions, 2004
- Exploiting supramolecular chemistry in metal recovery: novel zwitterionic extractants for nickel(ii) saltsDalton Transactions, 2003
- Correlation between the reactivities and the computed conformational and electronic properties of N,S,O-mixed-donor crown ethersNew Journal of Chemistry, 2000
- A Macrobicyclic Receptor with Versatile Recognition Properties: Simultaneous Binding of an Ion Pair and Selective Complexation of DimethylsulfoxideJournal of the American Chemical Society, 2000
- Ditopic ligands for the simultaneous solvent extraction of cations and anionsChemical Communications, 1999
- Potassium cation induced switch in anion selectivity exhibited by heteroditopic ruthenium(II) and rhenium(I) bipyridyl bis(benzo-15-crown-5) ion pair receptorsChemical Communications, 1998
- A Difunctional Receptor for the Simultaneous Complexation of Anions and Cations; Recognition of KH2PO4Angewandte Chemie International Edition in English, 1994
- Anion cryptates: highly stable and selective macrotricyclic anion inclusion complexesJournal of the American Chemical Society, 1976