Abstract
Abstract 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.
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