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The 13C Dipole-Dipole Relaxation and Pseudorotation of Some Macrocyclic Ethers and a Polyoxalactone

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The 13C dipole-dipole relaxation times of tetraoxa-, pentaoxa-, hexaoxa-cyclooctadecane, and dioxohexaoxacyclooctadecane were obtained in acetone-d6 by the aid of the inversion recovery method at 15.0 MHz. The dependence of dipolar relaxation time on the molecular size and the conformational aspects of cyclo-polyoxa molecules, (CH2OCH2)n, are discussed from the point of view of the cation-binding properties of such compounds. It is concluded that the T 1 DD values reflect the rate of pseudorotation and therefore the flexible nature of the ring which causes the preference of the cation binding; accordingly, the rigidity determines the degree of stability of ion-molecule complexes.

Keywords: HMR; Macrocyclic ethers

Document Type: Research Article


Affiliations: University of Dicle, Faculty of Art and Sciences, Diyabakir, Turkey

Publication date: January 1, 1986

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