Li-7-NMR and FTIR studies of lithium, potassium, rubidium, and cesium complexes with ionophore lasalocid in solution

摘要

Lasalocid metal salts were combined with 1 : 1 lithium and 2:2 potassium, rubidium, and cesium to form complexes. The nature of the lasolocid salt complexes was studied in a solid and chloroform by FTIR spectroscopy in the middle and far IR regions. The process of the complexation of lithium was also studied by Li-7-NMR. In chloroform a 1 : 1 complex of lasalocid and Li+ ions was formed. Continuous absorption was observed in the far FTIR spectrum of this complex. It indicated large Li+ polarizability, which was due to fast fluctuations of the Li+ ions in the multiminima potentials, in the monomeric structure. In the lasalocid salt with the other monovalent cations (K+, Rb+, Cs+) 2:2 complexes were formed in which the cations showed cation polarizability, which strongly depended on the mass and the radius of the cations. (C) 2001 John Wiley & Sons, Inc. [References: 44]