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COOH-Py forms multi-layered films with gold nanoparticles and nickel oxide, that can be used in biosensor applications. It may also be used in photoacoustic imaging based photothermal therapy. It can also form electropolymerized thin films that find applications as microsensor electrode arrays.

1H-Pyrrole-1-propionic acid (COOH-Py) is a pyrrole (Py) derivative that acts as a conductive polymer with an acid functional group that gives an anionic character to the polymeric films. It can be prepared by the hydrolysis of 1-(2-cyanoethyl)pyrrole.

Recrystallise the acid from pet ether (b 80-100o) and dry it in vacuo. The ethyl ester has b 122o/23mm. The amide forms colourless needles from *C6H6 with m 81o and is soluble in cold H2O. [Clemo & Ramage J Chem Soc 49 1931, Jefford & Johncock Helv Chim Acta 66 2666 1983.]