title: 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.
authors.affiliation: Centre for Molecular Movies, Department of Chemistry and Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
authors.forename: Morten
authors.initials: M
authors.lastname: Christensen
authors.forename: Kristoffer
authors.initials: K
authors.lastname: Haldrup
authors.forename: Klaus
authors.initials: K
authors.lastname: Bechgaard
authors.forename: Robert
authors.initials: R
authors.lastname: Feidenhans'l
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Kong
authors.forename: Marco
authors.initials: M
authors.lastname: Cammarata
authors.forename: Manuela
authors.initials: M
authors.lastname: Lo Russo
authors.forename: Michael
authors.initials: M
authors.lastname: Wulff
authors.forename: Niels
authors.initials: N
authors.lastname: Harrit
authors.forename: Martin Meedom
authors.initials: MM
authors.lastname: Nielsen