H and 13C NMR relaxation times ( T , ) of ethoxycarbonylmethyl derivatives of p-t-butylcalix[n]arenes have been determined at 90 MHz and 36 "C in [2H,]THF. It was found that these calixarenes feature a 'seesaw motion' around the ArCH2Ar linkage as a central support and that this molecular motion is largely suppressed through complexation with Na'.
Relaxation times of ethoxycarbonylmethyl derivatives of p-t-butylcalix[n]arenes (n = 4, 6, and 8) were estimated for the first time with 1H NMR. It was shown that the benzene units feature a “seesaw” motion around the ArCH2Ar circle and the motion is suppressed by Na+ serving as a template ion.
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