A galvinoxyl derivative of benzo-15-crown-5 (1) has been synthesized, and the complex formation between the spin labeled crown ether (1) and the alkali metal thiocyanate has been studied by ESR measurement. A typical triplet ESR spectrum was observed for the potassium complex in ethanol rigid matrix at 77 K, clearly indicating the (1:2) complex formation between the KNCS salt and the 1. On the other hand, the sodium complex showed a symmetrical single line, suggesting the (1:1) complex formation between the NaNCS salt and the 1.
ESR Investigation of Alkali Metal Complexes of Galvinoxyl-labeled Benzo-15-crown-5 in Frozen Solution
作者:Kazuo Mukai、Nobuhito Iida、Kazuhiko Ishizu
DOI:10.1246/bcsj.55.1362
日期:1982.5
values are observed for all the (2:1) complexes, indicating similar conformation of the ligand molecule 1. The zero-field splitting parameters (D and E) are calculated on the basis of the spin distribution of 1 and the assumed molecular structures for the (2:1) complex. By comparing the observed D and E parameters with the calculated ones, the structure of the (2:1) complex in ethanol rigid matrix is discussed