FTIR and NMR of 1H, 13C, 11B, 7Li and 23Na nuclei were used for the study of the complexation of Li+ and Na+ cations by three tris(oxaalkyl) borates. The NMR techniques proved the formation of complexes and the fluctuation of Li+ and Na+ cations in the respective channels formed by three oxaalkyl chains. In the FTIR spectra of Li+ complexes with three tris(oxaalkyl) borates, continuous absorption in the far-infrared region indicates the fast fluctuations of Li+ ion between O atoms of the channels. The dependence of the continua shape on the length of the channels, i.e., the number of minima in the multiminima potentials, demonstrates that the fluctuation of Li+ ion occurs along the channel. Owing to the larger mass and diameter of the Na+ cation in the Na+–tris(oxaalkyl) borate complexes, only systems with longer channels show a large Na+ polarizability due to the fast fluctuation of Na+ cations in a multiminima potential.
FTIR和NMR(1H、13C、11B、7Li和23Na核)用于研究Li+和Na+阳离子与三种三(氧烷基)
硼酸盐的络合。NMR技术证明了络合物的形成以及Li+和Na+阳离子在三条氧烷基链形成的相应通道中的波动。在Li+与三种三(氧烷基)
硼酸盐的络合物FTIR光谱中,远红外区域的连续吸收表明Li+离子在通道的O原子之间快速波动。连续吸收形状对通道长度的依赖性,即多重势能中的极小值数量,表明Li+离子的波动沿通道发生。由于Na+阳离子在Na+–三(氧烷基)
硼酸盐络合物中的质量和直径较大,仅有较长通道的系统显示出较大的Na+极化率,这是由于Na+阳离子在多重势能中快速波动所致。