Synthesis and Properties of Alternating Acceptor−Donor Copolymers of Squaric Acid with 1-Dodecyl- and 3-Dodecylpyrroles†

摘要: Polycondensation between the acceptor−donor monomer combination of squaric acid with 1-dodecyl- and 3-dodecylpyrroles provided conjugated macromolecules having two types isomeric repeating units, depending upon reaction conditions employed. Under azeotropic distillation using 1-butanol−benzene solvent mixture (route A), most preferred 1,3-zwitterionic units were mostly formed, whereas in DMSO−acetic under room temperature B), considerable amounts 1,2-diketonic also formed along zwitterionic units. Evidence for structural differences polycondensation products obtained by routes A B could be from detailed IR spectral analysis studies their physical properties such as solubility, molecular weight, optical absorption, solvatochromism, conducting properties. The solubilities weights obt...