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

✍ Scribed by Radosław Pankiewicz; Grzegorz Schroeder; Błażej Gierczyk; Grzegorz Wojciechowski; Bogumił Brzezinski; Franz Bartl; Georg Zundel

• Publisher: Wiley (John Wiley & Sons)
• Year: 2001
• Tongue: English
• Weight: 310 KB
• Volume: 62
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1012

✦ Synopsis

Abstract

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 ^7^Li‐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. © 2001 John Wiley & Sons, Inc. Biopolymers (Biospectroscopy) 62: 173–182, 2001