Signatures of technetium oxidation states: a new approach

TL;DR

This paper introduces a new XANES-based method for accurately determining technetium oxidation states across a wide range of compounds, enhancing understanding of Tc chemistry.

Contribution

The study presents a comprehensive XANES approach combined with crystal-field multiplet simulations for precise Tc oxidation state identification.

Findings

Identified clear absorption edge shifts correlating with oxidation states

Validated method across 99Tc compounds from oxidation states I to VII

Enhanced understanding of Tc coordination chemistry

Abstract

A general strategy for the determination of Tc oxidation state by new approach involving X-ray absorption near edge spectroscopy (XANES) at the Tc L3 edge is shown. A comprehensive series of 99Tc compounds, ranging from oxidation states I to VII, was measured and subsequently simulated within the framework of crystal-field multiplet theory. The observable trends in the absorption edge energy shift in combination with the spectral shape allow for a deeper understanding of complicated Tc coordination chemistry. This approach can be extended to numerous studies of Tc systems as this method is one of the most sensitive methods for accurate Tc oxidation state and ligand characterization.