Solvatochromism in poly[3-(10-hydroxydecyl)]thiophene: a spectrokinetic study of the conformational transition

✍ Scribed by F. Bertinelli; C. Delta Casa

• Book ID: 104164307
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 716 KB
• Volume: 37
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00362-x

✦ Synopsis

The solvatochromic conformational transformation of electroconductive poly [3-(10-hydroxydecyl)]thiophene in dimethylpropyleneurea solution, due to the addition of poor solvent, was investigated. A red shift of 80 nm in the ultraviolet-visible absorption maximum suggests a much more extended conjugated 7r-system for the new conformation. The time scale of this change allows a spectrokinetic analysis as a function of the type and amount of poor solvent. Second-order reaction kinetics are evident in all cases, and this is interpreted within the framework of an intrachain rearrangement leading to a higher coplanarity of thiophene rings in the new phase. A solid phase, laid down at very long times, gives insight about the final steps of an association process.