Na[Tc(CO)(CNp-F-ArDArF2)4]: an isocyanide analogue of the elusive Na[Tc(CO)5]

Abstract

The first crystalline technetium complex in a negative oxidation state, [Tc^−I(CO)(CNp-F-Ar^DArF2)₄]⁻, was isolated and structurally characterized as its [Na(Crypt-2.2.2)]⁺ salt. It mirrors the properties of the textbook organometallic compound Na[Tc(CO)₅], which has eluded isolation and structural characterization until today. [Na(Crypt-2.2.2)][Tc^−I(CO)(CNp-F-Ar^DArF2)₄] reacts expectedly as a nucleophile, which is demonstrated by reactions with HCl and ClSnMe₃. They give the unprecedented monohydrido and trimethylstannyl complexes of technetium.