Electronic and Molecular Structure of Photoexcited [RuII(bpy)3]2+ Probed by Picosecond X-ray Absorption Spectroscopy
L2,3 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)]
Keywords: 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 structure
Optical, Electron, and Mass Spectroscopy and Other Related Properties
Laboratoire de Spectroscopie Ultrarapide, Institut des Sciences et Ingenierie Chimiques,Ecole Polytechnique Federale de Lausanne,Lausanne-Dorigny,Switz.
written in English.
15158-62-0 (Tris(2,2'-bipyridine)ruthenium(2+) Role: PRP (Properties) (electronic and mol. structure in ground and photoexcited state probed by picosecond x-ray absorption spectra)
Record created on 2007-05-31, modified on 2016-08-08