Spin Label Investigation of the Crown Ether. Complex Formation between the Veratrole Analogue of Phenoxyl-labeled Benzo-15-crown-5 and Alkali and Alkaline Earth Metal Salts in Frozen Solution
A stable “phenoxyl-veratrole” (2), a veratrole analogue of “phenoxyl-benzo-15-crown-5” (1), was prepared and the complexformationbetween 2 and the alkali and alkaline earth metal salts has been studied by the ESR technique. Existence of the 2:1 complex of 2 with K+, Rb+, and Cs+ salts was confirmed by the observation of the triplet ESR spectra in ethanol rigid matrix at 77 K. Essentially the same