In the course of prolonged interaction in the system consisting of Тс(hfa)(СО) (hfa is the anion of 1,1,1,5,5,5-hexafluoroacetylacetone), triphenylphosphine (РРh) or pyridine (py), and CCl, the hfa anion is gradually displaced by the chloride ion with the formation of the complexes fac- and mer-ТсСl(СО)(РРh) and fac-ТсСl(СО)(py). The crystal and molecular structures of the complexes were determined. The complex fac ТсСl(СО)(РРh) is the first structurally confirmed example of technetium(I) tricarbonyl bis(triphenylphosphine) complexes of facial structure.
Sidorenko et al. (2025) studied this question.