Pentamethylcyclopentadienyl iron thiocarboxylato complexes: synthetic and characterization study

Pentamethylcyclopentadienyldicarbonyl iron thiocarboxylato complexes Cp*Fe(CO)(2)SCOR {Cp* = C5Me5, R = Me (2a), Ph (2b), C4H3O (2c), C4H3S (2d), CH2CH2COCl (2e)} are synthesized from the reaction of Cp*Fe(CO)(2)SH (1) with the corresponding chloride acids. Complex 1 is obtained from the treatment of [Cp*Fe(CO)(2)](2) with elemental sulfur (S-8) followed by hydrolysis on silica. The hydrolysis of 2e with trace amount of water gave the corresponding acid derivative Cp*Fe(CO)(2)SCOCH2CH2COOH (3). All new complexes have been characterized by IR, H-1 NMR spectroscopy and elemental analysis. The solid state structures of 1 and 3 are confirmed by X-ray analysis.