Abstract
The addition of dibenzo-18-crown-6 to a solution of 5,12-dihydrotetracene in tetrahydrofuran has been found to reduce dramatically the rate of cation migration when Li+ is the counterion. The resulting e.s.r. spectra, which exhibit linewidth alternation, have been computer-simulated employing modified Bloch equations. The activation energy for this process has been found to be 13.5 kJ mol–1. Linewidth alternation is also present when K+ is the counterion, and is accompanied by a significant change in the various splitting constants as the ‘fast exchange’ region is approached.
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Schedule a callMore From: Journal of the Chemical Society, Perkin Transactions 2
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