Time-resolved X-ray scattering of an electronically excited state in solution. Structure of the 3A(2u) state of tetrakis-mu-pyrophosphitodiplatinate(II).

Abstract

The structure of the (3)A(2u) excited state of tetrakis-mu-pyrophosphitodiplatinate(II) in aqueous solution is investigated by time-resolved X-ray scattering on a time scale from 100 ps to 1 micros after optical pumping. The primary structural parameter, the Pt-Pt distance, is found to be 2.74 A, which is 0.24 A 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 (3)A(2u) excited state was determined to be 2.93 A, 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.

DOI: 10.1021/ja804485d

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Cite this paper

@article{Christensen2009TimeresolvedXS, title={Time-resolved X-ray scattering of an electronically excited state in solution. Structure of the 3A(2u) state of tetrakis-mu-pyrophosphitodiplatinate(II).}, author={Morten Christensen and Kristoffer Haldrup and Klaus Bechgaard and Robert Feidenhans'l and Qingyu Kong and Marco Cammarata and Manuela Lo Russo and Michael Wulff and Niels H. Harrit and Martin M Nielsen}, journal={Journal of the American Chemical Society}, year={2009}, volume={131 2}, pages={502-8} }