Evaluation of the relative importance of Ti-Cl center dot center dot center dot H-N hydrogen bonds and supramolecular interactions between perfluorophenyl rings in the crystal structures of [Ti(NR)Cl-2(NHMe2)(2)] (R = Pr-i, C6H5 or C6F5)

The three closely-related compounds [Ti-(NiPr)Cl2(NHMe2)2] 1, [Ti(N6H5)Cl2(NHMe2)2] 2 and [Ti(NC6F5)Cl2(NHMe2)2] 3 all crystallize in the space group C2/c with the titanium atoms lying on two-fold axes at (0, y, 1/4); in compounds 1 and 2 the molecules are linked in one-dimensional infinite chains by intermolecular Ti-Cl···H-N hydrogen bonds along the direction of the crystallographic c axis, whereas in 3 offset face-to-face interactions between the C6F5 rings break down the hydrogen bonded chains.