Dissecting Local Atomic and Intermolecular Interactions of Transition-Metal Ions in Solution with Selective X-ray Spectroscopy
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- 作者：Philippe Wernet ; Kristjan Kunnus ; Simon Schreck ; Wilson Quevedo ; Reshmi Kurian ; Simone Techert ; Frank M. F. de Groot ; Michael Odelius ; Alexander F枚hlisch
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：December 6, 2012
- 年：2012
- 卷：3
- 期：23
- 页码：3448-3453
- 全文大小：361K
- 年卷期：v.3,no.23(December 6, 2012)
- ISSN：1948-7185
文摘
Determining covalent and charge-transfer contributions to bonding in solution has remained an experimental challenge. Here, the quenching of fluorescence decay channels as expressed in dips in the L-edge X-ray spectra of solvated 3d transition-metal ions and complexes was reported as a probe. With a full set of experimental and theoretical ab initio L-edge X-ray spectra of aqueous Cr3+, including resonant inelastic X-ray scattering, we address covalency and charge transfer for this prototypical transition-metal ion in solution. We dissect local atomic effects from intermolecular interactions and quantify X-ray optical effects. We find no evidence for the asserted ultrafast charge transfer to the solvent and show that the dips are readily explained by X-ray optical effects and local atomic state dependence of the fluorescence yield. Instead, we find, besides ionic interactions, a covalent contribution to the bonding in the aqueous complex of ligand-to-metal charge-transfer character.