Gawelda, WojciechJohnson, Melaniede Groot, Frank M. F.Abela, RafaelBressler, ChristianChergui, Majed2007-05-312007-05-312007-05-31200610.1021/ja054932khttps://infoscience.epfl.ch/handle/20.500.14299/7501WOS:0002369172000318491L2,3 x-ray absorption spectra of aq. [RuII(bpy)3]2+ were recorded in its ground and excited states, 50 ps after short pulse laser excitation. Significant changes in both the XANES (x-ray Near-Edge Absorption Structure) and the EXAFS (Extended x-ray Absorption Fine Structure) regions of the excited state complex are detected. The XANES line shapes were quant. simulated using a crystal field multiplet code in trigonal symmetry. Spectral changes in the EXAFS region of both ground and excited states are analyzed to ext. structural parameters of their corresponding mol. structures. A Ru-N bond contraction by .apprx.0.03 .ANG. in the excited-state complex, as compared to the ground-state compd., was obtained. This contraction results from electrostatic and polarization contributions, limited by steric constraints on the bpy ligands. [on SciFinder (R)]Ground state (electronic and mol. structure probed by picosecond x-ray absorption spectra of ruthenium bipyridine complex in); Electronic structure; Molecular structure (of ruthenium bipyridine complex in ground and photoexcited state probed by picosecond x-ray absorption spectra); EXAFS spectra; X-ray spectra; XANES spectra (of ruthenium bipyridine photoexcited complex in ground and photoexcited state in relation to electronic and mol. structure); Excited state (photo-; electronic and mol. structure probed by picosecond x-ray absorption spectra of ruthenium bipyridine complex in)x ray spectra ruthenium bipyridine photoexcited electronic mol structuretext::journal::journal article::research article