Preparation and Properties of Nitridotechnetic(VI) Acid. I. Observation of the E.S.R.-Spectrum of the [TcNF₄]^- Anion in Hydrofluoric Acid Solution

Abstract

Nitridotechnetic (VI) acid has been prepared by the hydrolysis of Cs₂TcNCl₅. Dissolution of this compound in concentrated HF gave an e.s.r. spectrum due to [TcNF4: g 1.895, g 1.990, A 0.03765 cm^-1, A 0.01795 cm^-1, Q 0.00052 cm^-1 for Tc^vi ; a, 0.0052 cm^-l, a_y 0.0010 cm^-l, a_z , < 0.0002 cm^-1 due to F^-. A comparison of the 4d_xy MO coefficient, β₂, with those for [TcNCI₄]- and [TcNBr₄]-indicates that the Tc =N bond length is greater in [TcNF₄]- than in [TcNCI₄]- and [TcNBr₄]^-.