Abstract
1. The formation enthalpies and dipole moments of the complexes of trifluoroacetic acid (TFAA) with tributyl-, tricyclohexyl-, and triphenylphosphine were measured. 2. The smaller formation enthalpy of the complex of TFAA with (C6H5)3P when compared with aliphatic phosphines is probably not related to the steric factor, but rather to the energy consumed in breaking the pπ-conjugation in triphenylphosphine during complexing.
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