Cation-induced charge-transfer absorptions of oligooxa[n.n]Paracyclophane quinhydrones

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Abstract

Intramolecular [n.n]paracyclophane quinhydrones with two oligo= oxaalkylene bridges 2a–e (m = 0,1,2,3 and 4, resp.) have been synthesized. The selective double complexation of these compounds with metal cations of suitable size (e.g. 7) is indicated by remarkable enhancements of the intensity of charge-transfer absorptions.

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