Poly acetylene electron delocalization

When the 7r-systems of two or more double bonds overlap, as in conjugated dienes and polyenes, the 7r-electrons will be delocalized. This has chemical consequences, which implies that the range of possible chemical reactions is vastly extended over that of the alkenes. Examples are various per icy die reactions or charge transport in doped poly-acetylenes. A detailed understanding of the electronic structure of polyenes is therefore of utmost importance for development within this field. We will first discuss the structure of dienes and polyenes based on theoretical studies. Thereafter the results from experimental studies are presented and discussed. 

With the realization of poly acetylenes and other conjugated heteronuclear polymers as potentially important electronic and optically active materials, research on electron delocalized organic and metalloorganic polymers has received much... 

This unique intrinsic conductivity of these organic materials, which generally are comprised simply of C, H and simple heteroatoms such as N and S, and the myriad of properties emanating from it, arise uniquely from v-conjugation. That is to say, a sometimes fairly extended and delocalized conjugation originating in overlap of ir-electrons. Such conjugation is illustrated somewhat simplistically in Fig. 1-1 below for poly(acetylene), a prototypical CP. 

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