Conducting Polymers:           

Alkynes are hydrocarbons which contain a carbon-carbon triple bond, e.g. ethyne (C₂H₂):

H - C C - H.

When ethyne is polymerised, the product contains alternating single and double bonds.  Due to geometrical isomerism, two forms of polyethyne are produced: cis-polyethyne and trans-polyethyne.  By using a Ziegler-Natta catalyst it was possible to produce just the cis form which on warming was found to conduct electricity.