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organic compounds
The crystal structures C18H12Cl3P (1) and C18H12F3P (2) have been determined. In (1) the average P—C distance and C—P—C angle are 1.834 (2) Å and 101.9 (1)°, respectively, while in (2) they are 1.825 (5) Å and 102.5 (2)°. Intermolecular C—HF hydrogen bonds are observed in (2).