Polyarylmethylidenes - Low Band Gap Polymers
Polyhetarenemethylidenes - Low Band Gap Polymers
The Structure in fig. 1 shows a general formula of polyhetarenemethylidenes. The monomers
possess alternating aromatic and quinoid subunits. The polymers are synthesized by chemical
and electrochemical polymerisation [1].
X= S, SO, SO
2
, CH=CH
Y= S, N-R, O, CH=CH
Z= S, CH=CH, 1,2- Dimethylbenzene
Fig. 1:
Polyhetarenemethylidenes
The band gap was calculated by methods to be ╗ 1 eV, also in the
undoped state, in contrast to polythiophene or polyacetylene. Not only the normal
conductivity, but also the photoconductivity of the compunds have an interesting potential.
Most of the polyhetarenemethylidenes exist in the planar Z,Z-configuration (fig. 2). The
E,E-configuration was proven only for compound[2].
1
= Z,Z-configuration,
2
= E,E-configuration
Literature:
-
[1] M. Hanack, U. Schmid, S. Echinger, F. Teichert, J. Hieber,
Synthesis
6
-
[2] M. Hanack, K.-M. Mangold, U. R÷hrig, C. Maichle-M÷ssmer,
Synth. Met.
60
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