207735-34-0Relevant articles and documents
Ag+-Specific Pyridine Podands: Effects of Ligand Geometry and Stereochemically Controlled Substitution on Cation Complexation and Transport Functions
Tsukube, Hiroshi,Shinoda, Satoshi,Uenishi, Jun'Ichi,Hiraoka, Takao,Imakoga, Takahiro,Yonemitsu, Osamu
, p. 3884 - 3894 (2007/10/03)
A new series of acyclic podands was designed so that three pyridine moieties cooperatively bind a guest Ag+. Liquid-liquid extraction, NMR binding, and computer calculation experiments reveal that podands with three pyridine donors in a proper geometry exhibit a perfect Ag+ specificity. They selectively extracted Ag+ in the presence of equimolar Pb2+, Cu2+, Ni2+, Co2+, and Zn2+. Introduction of two chiral centers close to the pyridine binding sites surprisingly influences the Ag+-binding ability of the podand. Fourteen new pyridine podands were evaluated as carriers in a liquid membrane transport system. A combination of ligand geometry and stereocontrolled substitution provides excellent Ag+-speeific transport.