DocumentCode :
1912742
Title :
Narrow gap polymers and the quinonoid-aromatic transition
Author :
Kertesz, M.
Author_Institution :
Georgetown University
fYear :
1994
fDate :
24-29 July 1994
Firstpage :
694
Lastpage :
694
Abstract :
Summary form only given. A large group of conducting polymers possesses a nondegenerate ground state which can be structurally described as aromatic (A) or quinonoid (Q). Due to the strong electron - nuclear coupling typical for these conjugated materials, most of them change their structures significantly upon electronic excitation or doping: ones with an A ground state move towards a Q structure and vice versa. We review the following aspects of this A - Q transition: -Design of low band gap polymers via the control of the A - Q transition through side groups, topological modifications, copolymerization of groups with A and Q ground states with or without methine linking groups; -Interpretation of the electronic structures of new ladder polymers; -Calculation and interpretation of the vibrational spectra (IR and Raman) of doped and undoped poly(p-phenylene), PPP, and thiophene derivatives, determination of the percentage of Q character in doped PPP.
Keywords :
Chemistry; Conducting materials; Doping; Electrons; Nuclear electronics; Photonic band gap; Polyethylene; Polymer films; Positron emission tomography; Stationary state;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Science and Technology of Synthetic Metals, 1994. ICSM '94. International Conference on
Conference_Location :
Seoul, Korea
Type :
conf
DOI :
10.1109/STSM.1994.836137
Filename :
836137
Link To Document :
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