EXAFS structural determination of the Pt-2(P2O5H2)(4)(4-) anion in solution

We present the first structural determination of the Pt-2(P2O5H2)(4)(4-) anion in solution by analyzing the extended X-ray absorption fine structure (EXAFS) spectrum of the Pt L-III edge. The data could be fit with a simple model involving single and multiple scattering paths to near and far P-atoms, bridging O-atoms, and the other Pt-atom in the binuclear complex. A Pt-Pt distance of 2.876(28) angstrom and a Pt-P bond length of 2.32(4) angstrom are obtained. These values are in line with distances found in previous X-ray diffraction studies. The assignment of the EXAFS spectrum of the Pt-2(P2O5H2)(4)(4-) anion in its ground state is required for future time-resolved X-ray absorption measurements with the goal of determining the structure and dynamics of the complex in the (1,3)A(2u) excited states.