Synthesis and charge-transfer spectra of dinitrofluorenone-containing polyesters

Abstract

π-Electron acceptor polyesters are synthesized by polycondensation of the cesium salt of 4,5-dinitrofluorenone-2,7-dicarboxylic acid with α,ω-dibromoalkanes and p-xylylene dibromide. The properties of the polyesters depend on the length of the hydrocarbon residue between the acceptor fragments. The charge-transfer complexes of the synthesized polyesters with N-ethyl carbazole, poly-N-vinyl carbazole, and poly-N-epoxypropyl carbazole are studied and it is established that in all cases their 1 : 1 complexes are formed. The stability constants are only weakly dependent on the length of the methylene chain of the polyesters.