Microsecond-resolved XAFS of the triplet excited state of Pt 2(P2O5H2)4-4

Daniel J. Thiel, Peteris Liviņš, Edward A. Stern, Aaron Lewis

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


Little is known about the excited-state structures of most inorganic compounds. Time-resolved resonance Raman and time-resolved infrared spectroscopies can provide only indirect structural information for short-lived excited species in solution at room temperature. Time-resolved X-ray diffraction1 has the potential to give more direct information, but no excited-state structures have yet been reported; picosecond gas-phase electron diffraction has been proposed recently2, but not yet demonstrated. Here we report a technique that combines the X-ray absorption fine-structure (XAFS) method3 with rapid-flow laser spectroscopy 4 to measure structural changes in a solution-phase excited-state transition-metal complex with microsecond resolution. We find that the triplet excited state of Pt2(P2O5H2) 4-4, with a lifetime of about 4 μs undergoes a contraction in the Pt-Pt distance of 0.52 ±0.13 Å relative to the ground state. We anticipate that time-resolved XAFS will have broad applications in chemistry and biology.

Original languageEnglish
Pages (from-to)40-43
Number of pages4
Issue number6415
StatePublished - 4 Mar 1993
Externally publishedYes


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