Frons-polyacetylene

The morphology of all polyacetylenes made with various Ziegler-Natta catalysts is fibrillar. The conductivity of films of polyacetylene depends on the cis-trans content, varying from 10 (ohm-cm) for the trans material to 10 (ohm-cm) for the cis isomer. Doping increases the conductivity of both cis- and frons-polyacetylene drastically. 

In the next section we describe how the semiempirical Pariser-Parr-Pople-Peierls model - a correlated 7r-electron model with electron-lattice coupling -quantitatively predicts the excitation spectrum of polyene oligomers, while it qualitatively predicts the spectrum for frons-polyacetylene thin films. 

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