Time-Resolved X-ray Scattering of an Electronically Excited State in Solution. Structure of the 3A2u State of Tetrakis-μ-pyrophosphitodiplatinate(II)

详细信息    查看全文

• 作者：Morten Christensen ; Kristoffer Haldrup ; Klaus Bechgaard ; Robert Feidenhans’ ; l ; Qingyu Kong ; Marco Cammarata ; Manuela Lo Russo ; Michael Wulff ; Niels Harrit ; Martin Meedom Nielsen
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：January 21, 2009
• 年：2009
• 卷：131
• 期：2
• 页码：502-508
• 全文大小：280K
• 年卷期：v.131,no.2(January 21, 2009)
• ISSN：1520-5126

文摘

The structure of the ³Ab>2ub> 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 ³Ab>2ub> 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.