Diesters with the structure C6Hs--COO--(CH2)m--OOC--C6Hs, m = 2-6, have been synthesized, and their fluorescence has been measured in dilute solution in viscous solvents. These diesters are model compounds for polyesters prepared from isophthalate or terephthalate and HO(CH2)mOH. Comparison of the fluorescence of the diesters with the fluorescence of the polyesters, reported earlier, shows that energy migration is not an important mechanism for the population of excimers in the polymers. The agreement between the experimentally determined dependence of excimer emission on m and the theoretical dependence of the population of excimer forming conformations on m is improved by consideration of interactions higher than second order, especially for the largest member of the series.
Посилання на статтю:
Dependence on spacer size of the intramolecular excimer emission from model compounds for polyesters derived from isophthalic or terephthalic acid / Bharat Patel, Francisco Mendicuti* and Wayne L. Matticet // Polymer. – 1992. – Vol 33. – P. 239-242.