New rhenium(III) complexes with fluorinated β-diketones

Five new rhenium(III) complexes of the general formula ReCl 2 (R F COCHCOR F )(PPh 3 )(OPPh 3 ), where R F = CF 3 ( I ), C 2 F 5 ( II ), C 3 F 7 ( III ), C 4 F 9 ( IV ), and CF 3 CFOC 3 F 7 ( V ), were synthesized. The known rhenium(V) complex ReOCl 2 (OC 2 H 5 )(PPh 3 ) 2 , which can readily be obtained from metallic rhenium, was used as a precursor. Two polymorphous modifications of compound I were found and studied by X-ray diffraction analysis. The thermal properties of the synthesized complexes were characterized by the DTA-TG method.