Polyester of dimethyl 7-(N-pyrrolidinyl)-2,7-cycloheptadiene-1,2-dicarboxylate and its lithium triflate complex

A new polyester, poly[ethylene 7‐(N‐pyrrolidinyl)‐2,7‐cycloheptadiene‐1,2‐dicarboxylate] and its lithium triflate complex have been successfully synthesized and characterized in detail. Solution studies (viscosity and electronic spectroscopy) were realized in two different solvent mixtures, dimethyl sulphoxide (DMSO)/dimethyl formamide (DMF) (1:1 v/v) and DMSO/p‐chlorophenol (p‐CP) (1:1 v/v). DMSO/p‐CP was a better solvent mixture to obtain Li+ ion‐doped polyester. FTIR spectra supported the complex formation. According to viscosimetric measurements the polymer was a low molecular weight polyester. In DTG analysis, the polymer decomposed by a multi‐step process whereas two‐step decomposition was observed for polymer–Li+ ion complex. The glass transition temperature of the polyester and its Li+complex were determined as 345°C and 360°C respectively by means of DSC analysis. © 2002 Wiley Periodicals, Inc. Adv Polym Techn 21: 125–131, 2002; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/adv.10013