New Pai (π)-Conjugated Systems Comprising Selenophene and Thiophene Derivatives

Das, Soumyajit (2011) New Pai (π)-Conjugated Systems Comprising Selenophene and Thiophene Derivatives. PhD thesis, Indian Institute of Science Education & Research Kolkata.

PDF (PhD thesis of Soumyajit Das) Soumyajit_-Das-thesis.pdf - Submitted Version Restricted to Repository staff only Download (8MB)

Abstract

This thesis deals with synthesis and characterization of new polymers comprising group-16 aromatic heterocycle, mainly, cyclopenta[c]thiophene or cyclopenta[c]selenophene derivatives and their applications as electronic materials. Dimethoxymethyl-cyclopenta[c]selenophene was prepared for the first time. Related various regiosymmetric polyselenophenes were prepared and compared with analogous polythiophenes. A part of the thesis deals with development of new solution processable polymers comprising didodecyloxymethyl-cyclopenta[c]thiophene as donor which is successfully applied in fabricating polymer field effect transistors. A series of new donor-acceptor type low band gap copolymers comprising cyclopenta[c]thiophene as active donor unit and benzothiadiazole, benzoselenadiazole, benzotriazole as acceptor were synthesized and characterized. Two new carbohydrate-functionalized oligothiophenes, comprising cyclopenta[c]thiophene as central unit, were synthesized and exploited in lectin binding studies. A novel, mild and simplified synthetic strategy for 3,4-ethylenedioxythiophene and 3,4- ethylenedioxyselenophene, the most sought after key monomers in the field of organic electronics as well as in polythiophene and polyselenophene chemistry, was developed.

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