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Crystals of the title compound are monoclinic, space group P21/c , with a = 6-14 (1), b = 26.405 (15), c = 7.47 (1)/~, fl = 114.42 (5) °, Z = 4. The structure was determined by direct methods from X-ray counter data and refined by least-squares calculations to R = 4.6% for 1264 observed amplitudes. The molecules pack in a disordered manner, so that the H atom and the three ortho F atoms are distributed (unequally) over the four ortho positions. The angle between the phenyl rings is 59.5 ° and the length of the inter-ring bond is