Abstract
The solid state structures of six complexes {fac-[Re(Acac)(CO)3(PPhCy2)] (3), fac-[Re(Acac)(CO)3(PCy3)] (4), fac-[Re(Benzac)(CO)3(PPh3)] (7), fac-[Re(Tfaa)(CO)3(PPh3)] (10), fac-[Re(Hfaa)(CO)3(PPh3)] (13) and fac-[Re(Trop)(CO)3(PTA)] (15)}; acetylacetone = Acac, trifluoroacetylacetone = Tfaa, benzoylacetone = Benzac, hexafluoroacetylacetone = Hfaa and tropolone = Trop are reported. The complexes were synthesised in high yield and purity, using the “2 + 1” mixed ligand concept and the characterisation was done by spectroscopic methods IR, NMR, UV/Vis and elemental analysis. A kinetic study of the methanol substitution of fac-[Re(CO)3(Acac)(CH3OH)] (2), fac-[Re(CO)3(Benzac)(CH3OH)] (6) fac-[Re(CO)3(Tfaa)(CH3OH)] (9) and fac-[Re(CO)3(Hfaa)(CH3OH)] (12), by triphenylphosphine - PPh3, cyclohexyl diphenylphosphine - PPh2Cy, dicyclohexyl phenylphosphine - PPhCy2 and tricyclohexyl phosphine - PCy3 is performed. The reaction rates for 2, 6, 9 and 12 with PPh3 occurred in the following decreasing order: Benzac > Acac > Tfaa > Hfaa.
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