Evaluation of the relative importance of Ti–Cl⋯H–N hydrogen bonds and supramolecular interactions between perfluorophenyl rings in the crystal structures of Ti(NR)Cl2(NHMe2)2 (R = iPr, C6H5 or C6F5)Electronic supplementary information (ESI) available: characterisation and crystal data for compounds 1–3. See http://www.rsc.org/suppdata/cc/b1/b109251k/