Pyrrole derivatives bearing a side-on liquid crystal group form stable Langmuir films at the gas-water interface. The compression isotherm of those unusual compounds exhibits a plateau which corresponds to a phase transition as demonstrated by Brewster angle microscopy and X-ray reflectivity measurements. Transfer of the monolayers onto solid substrate leads to Langmuir-Blodgett films in which in-plane orientation is found for the mesogenic parts. The liquid crystal groups are found to be lying more or less parallel to the dipping direction. This orientation is then perpendicular to that of disk-like molecules already described for their in-plane orientation. Finally, the effect of the exact molecular structure on the order parameter describing the orientational anisotropy of these pyrrole derivatives is discussed.