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We prepared bis(ω-(N-pyrrolyl)-n-undecyl)disulfide (BPUS) self-assembled (SA) monolayers and octadecylpyrrole (ODP) Langmuir-Blodgett (LB) monolayers in order to understand electrochemical properties of pyrrole derivatives. This study shows that the monolayers are not electrochemically oxidized to form polypyrrole. Instead, we propose the pyrrole monolayers form dimers and/or ketone type degradation...