EDA complex formation between 2,4,7‐trinitrofluorenone (TNF) and polyesters bearing pendant 9‐carbazolyl groups was studied in ethylene dichloride. The formation constant (K) decreases with increasing length of the main chain repeating units separating pendant donor groups and with decreasing degree of polycondensation. In all cases, the values of K in polymeric systems are larger than those for the monomer model system by factors less than three. Thermodynamic parameters for complex formation were also determined. The general trend of the polymer effect is to increase − ΔH, while the entropy term is not much different from the monomer model system. The origin of polymer effects is interpreted as due not only to neighbouring group effects but also to remote group effects, and simultaneous participation of more than one carbazolyl group in complexing an acceptor molecule is considered. The results are compared with the EDA complex formation by ethylenic polymers and polyurethanes with pendant carbazolyl groups.
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Tazuke et al. (1980) studied this question.
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