Time-Resolved X-ray Scattering of an Electronically Excited State in Solution. Structure of the 3 A 2u State of Tetrakis-μ-pyrophosphitodiplatinate(II)
2008; American Chemical Society; Volume: 131; Issue: 2 Linguagem: Inglês
10.1021/ja804485d
ISSN1943-2984
AutoresMorten Christensen, Kristoffer Haldrup, K. Bechgaard, R. Feidenhans’l, Qingyu Kong, Marco Cammarata, Manuela Lo Russo, Michaël Wulff, Niels Harrit, M. Nielsen,
Tópico(s)Electrochemical Analysis and Applications
ResumoThe structure of the 3A2u excited state of tetrakis-μ-pyrophosphitodiplatinate(II) 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 3A2u 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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