| Sumario: | The structure of the ³A excited state of tetrakis-µ-pyrophosphitodiplatinate(ll) in aqueous solution is investigated by time-resolved X-ray scattering on a time scale from 100 ps to 1 µs after optical pumping. The primary structural parameter, the Pt-Pt distance, is found to be 2.74 Å, which is 0.24 Å shorter than the ground-state value. The contraction is in excellent agreement with earlier estimates based on spectroscopic data in solution and diffraction data in the crystalline state. As a second structural parameter, the distance between the P planes in the ³A excited state was determined to be 2.93 Å, i.e., the same as that in the ground state. This result implies that a slight lengthening of the Pt-P bond occurs following excitation.
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