Retrieving photochemically active structures by time-resolved EXAFS spectroscopy

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Describing the nature and structure of molecular excited states is important in order to understand their chemical reactivity and role as intermediates in photochemical reactions. The recent implementation of X-ray absorption spectroscopy in the ultrafast time domain allows studying the electronic and structural dynamics of photochemically active molecules in solutions. In this work we present the structural determination of a photoexcited diplatinum molecule, [Pt2(P2O 5H2)4]4-, which plays a photocatalytic role in important chemical conversions. A novel analysis of time-resolved EXAFS spectra based on the fitting of the experimental transients obtained from optical pump/x-ray probe experiments has been performed to derive a contraction of 0.31(5) of the two Pt atoms and a ligand expansion of 0.010(6) . The former is assigned to the formation of a transient Pt-Pt bond in the excited state, while the latter indicates a concomitant weakening of the Pt-ligand coordination bonds.

Detaljer

Författare
  • Renske M. Van Der Veen
  • Christian Bressler
  • Chris J. Milne
  • Amal El Nahhas
  • Frederico A. Lima
  • Wojciech Gawelda
  • Camelia N. Borca
  • Rafael Abela
  • Majed Chergui
  • Van-Thai Pham
Externa organisationer
  • Swiss Federal Institute of Technology
  • Paul Scherrer Institute
  • German Electron Synchrotron (DESY)
  • CSIC - Instituto de Óptica Daza de Valdés; (IO-CSIC)
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
Originalspråkengelska
Artikelnummer012054
TidskriftJournal of Physics: Conference Series
Volym190
Utgåva nummer1
StatusPublished - 2009 jan 1
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa