锂、钾、铷和铯与离子载体拉沙洛西在溶液中的配合物的7Li-核磁共振和傅里叶变换红外光谱研究。

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

作者信息

Pankiewicz R, Schroeder G, Gierczyk B, Wojciechowski G, Brzezinski B, Bartl F, Zundel G

机构信息

Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.

出版信息

Biopolymers. 2001;62(3):173-82. doi: 10.1002/bip.1012.

DOI:10.1002/bip.1012

PMID:11343288

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.

摘要

拉沙洛西金属盐与锂按1:1以及与钾、铷和铯按2:2结合形成配合物。通过傅里叶变换红外光谱法在中红外和远红外区域对拉沙洛西盐配合物在固体和氯仿中的性质进行了研究。还通过(7)Li-NMR研究了锂的络合过程。在氯仿中形成了拉沙洛西与Li(+)离子的1:1配合物。在该配合物的远红外傅里叶变换光谱中观察到连续吸收。这表明Li(+)具有较大的极化率，这是由于在单体结构中Li(+)离子在多极小势中快速波动所致。在拉沙洛西盐与其他单价阳离子（K(+)、Rb(+)、Cs(+)）形成的配合物中，形成了2:2配合物，其中阳离子表现出阳离子极化率，这强烈依赖于阳离子的质量和半径。