Issue 7, 1987

An electron spin resonance study of the equilibrium between tetrahalogeno- and pentahalogeno-nitridotechnetate(VI) ions in solution

Abstract

The e.s.r. spectra of [AsPh4][TcNCl4], Cs2[TcNCl5], [AsPh4][TcNBr4], and Cs2[TcNBr5] have been studied in non-aqueous and concentrated aqueous acid solutions. None of the spectra shows evidence for the co-ordination of a fifth halide ligand in the trans position, even under circumstances such as a 2 000-fold excess of halide ion, which would be expected to favour the formation of the pentahalogenonitridotechnetate ion. The predominant species in solution is the tetrahalogenonitrido-technetate ion, where the trans position may be vacant or occupied by a solvent molecule in the case of the non-aqeuous solvents and by a water molecule in the case of HCl and HBr solutions. This conclusion may be contrasted with the behaviour of a number of tetra- and penta-halogeno-oxometal complexes, where the equilibrium [MOX4]n+ X⇌[MOX5](n+ 1)– is clearly established.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1987, 1721-1725

An electron spin resonance study of the equilibrium between tetrahalogeno- and pentahalogeno-nitridotechnetate(VI) ions in solution

J. Baldas, J. F. Boas and J. Bonnyman, J. Chem. Soc., Dalton Trans., 1987, 1721 DOI: 10.1039/DT9870001721

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