Abstract
AbstractPolyesters with a pendant 9‐carbazolyl group were prepared by polycondensation of 9‐[5,5‐bis(hydroxymethyl)hexyl]carbazole (1a) with diethyl malonate, dimethyl terephthalate, and adipoyl chloride. Charge transfer complex formation of these polyesters and their monomeric model compound with 2,4,7‐trinitrofluorenone (TNF) was investigated by means of absorption spectroscopy in 1,2‐dichloroethane.Stability constants (K) of the polymeric systems were always larger than that of the monomeric system in the following order: polymer 3c (with the terephthaloyl unit) > polymer 3a (with the malonyl unit) ≈ polymer 3b (with the adipoyl unit) > 9‐[5,5‐bis‐(acetoxymethyl)hexyl]carbazole (2b).From the measurements of monomer and excimer emission in dilute solutions, interactions between the 9‐carbazolyl groups are discussed for the polymers and the monomeric model compound. For the polymer 3c (containing the terephthaloyl unit), exciplex formation between the 9‐carbazolyl group and the terephthaloyl group was demonstrated. Polymer effects on K are discussed based on the structural information obtained from fluorescence measurements.
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