Synthetic and thermochemical studies of fluorinated tertiary phosphine ligands R2PRf [R=Cy, Ph, iPr; Rf=CH2CH2(CF2)5CF3] in an organoiron system

The fluorinated phosphine ligands [PR2Rf (R=Cy (2); iPr, (3); Ph, (4); Rf=CH2CH2(CF2)5CF3] react with Fe(CO)3(BDA) (1) (BDA=(C6H5)CH=CHC(O)CH3, benzylideneacetone) to yield the corresponding Fe(CO)3(PR2Rf)2 (R=Cy, (5) iPr, (6) Ph, (7)) complexes. Infrared studies on the carbonyl complexes and solution calorimetry studies of the reaction of 1 with 2, 3 and 4 have been performed to quantify the donor strength of this series of ligands.