The speciation of Tc(VII) was studied in 12 M H₂SO₄ by NMR, UV-visible and XAFS spectroscopy. Experimental results and density functional calculations show the formation of TcO₃(OH)(H₂O)₂.

Receptors bearing hydrogen and halogen bond donors for recognition of perrhenate and pertechnetate were designed and studied. Acyclic hosts with N–H and C–H binding sites showed the best selectivity for TcO₄ ⁻ and ReO₄ ⁻ over spherical and more basic tetrahedral anions.