Azulene breaks the rules

Although simple models can be used to predict many important physical properties – such as conductance – in so-called alternant hydrocarbons, the same is not true for their non-alternant counterparts. This new result, from researchers in the US, Denmark and Israel, could be important for organic electronics and designing new electronic materials……..

http://nanotechweb.org/cws/article/tech/57224

Azulene