Renske M van der Veen et al 2009 J. Phys.: Conf. Ser. 190 012054 doi:10.1088/1742-6596/190/1/012054
Renske M van der Veen1,2, Christian Bressler1,2,3, Chris J Milne1, Van-Thai Pham1, Amal El Nahhas1, Frederico A Lima1, Wojciech Gawelda1,4, Camelia N Borca2, Rafael Abela2 and Majed Chergui1
Show affiliationsDescribing 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(P2O5H2)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) Å of the two Pt atoms and a ligand expansion of 0.010(6) Å. 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.
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Issue 1 (2009)
Renske M van der Veen et al 2009 J. Phys.: Conf. Ser. 190 012054
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