STRUCTURAL RELATIONSHIPS DERIVED FROM THE ANALYSIS OF ELECTRON-SPIN-RESONANCE SPECTRA OF SOME TECHNETIUM COMPLEXES

An extension of a method relating chemical structure to the ESR parameters A(parallel-to) and g(parallel-to) of paramagnetic technetium complexes is presented. Complexes having the same axial ligand lie in a narrow band of values of A(parallel-to) and g(parallel-to) such that Tc(II) nitrosyl and thionitrosyl complexes have distinctly different ESR parameters to Tc(VI) nitrido and oxo complexes. Thus the ESR spectrum of a solution resulting from a reaction where the nature of the product is in some doubt can be used to identify the oxidation state, the nature of the axial ligand and possible equatorial ligands.