Intramolecular excimer formation in polyesters from terephthalic acid and cyclohexanediols with different stereochemical compositions

Add time:07/15/2019    Source:sciencedirect.com

The fluorescence in dilute solution has been measured for five polyesters with terephthalate as the rigid aromatic unit and diols derived from cyclohexane as the flexible spacer. The spacers are 1,2-cis-cyclohexanediol, 1,2-trans-cyclohexanediol, a 1:2 mixture of 1,3-cis- and 1,3-trans-cyclohexanediols, a 1:2 mixture of 1,4-cis- and 1,4-trans-cyclohexanediols, and a 1:3 mixture of 1,4-cis- and 1,4-trans-cyclohexanedimethanol. The two polymers with the largest ratio of the intensities of excimer and monomer emission are those that contain either the 1:2 mixture of 1,3-cis- and 1,3-trans-cyclohexanediol or the 1:3 mixture of 1,4-cis- and 1,4-trans-cyclohexanedimethanol. A conformational analysis concludes that the spacers most conducive to excimer formation are the 1,3-cis-cyclohexanediol and 1,4-cis-cyclohexanedimethanol. This result from calculations is compatible with experimental results.

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