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Publication . Article . 2006

The hydration of Cu2+: Can the Jahn-Teller effect be detected in liquid solution?

Jesús Chaboy; Adela Muñoz-Páez; Patrick J. Merkling; Enrique Sánchez Marcos;
Open Access
English
Published: 01 Jan 2006
Publisher: American Institute of Physics
Country: Spain
Abstract
The long elusive structure of Cu(II) hydrate in aqueous solutions, classically described as a Jahn-Teller distorted octahedron and recently proposed to be a fivefold coordination structure [Pasquarello et al., Science 291, 856 (2001)], has been probed with x-ray-absorption spectroscopy by performing a combined theoretical and experimental analysis. Two absorption channels were needed to obtain a proper reproduction of the x-ray-absorption near-edge structure (XANES) region spectrum, as already observed in other Cu(II) complexes [Chaboy et al., Phys. Rev. B 71, 134208 (2005)]. The extended x-ray-absorption fine-structure (EXAFS) spectrum was analyzed as well within this approach. Quite good reproductions of both XANES and EXAFS spectra were attained for several distorted and undistorted structures previously proposed. Nevertheless, there is not a clearly preferred structure among those including four-, five-, and sixfold coordinated Cu(II) ions. Taking into account our results, as well as many more from several other authors using different techniques, the picture of a distorted octahedron for the Cu(II) hexahydrate in aqueous solution, paradigm of the Jahn-Teller effect, is no longer supported. In solution a dynamical view where the different structures exchange among themselves is the picture that better suits the results presented here.
This work was partially supported by Spanish CICYT MAT2002-04178-C04-03, BQU2002-02217, and BQU2002- 04364-C02-01 grants.
9 pages, 7 figures, 1 table.-- PACS 78.70.Dm 61.20.-p 61.25.Em
Peer reviewed
Subjects by Vocabulary

Microsoft Academic Graph classification: Hydrate Chemistry Aqueous solution Spectral line Octahedron Crystallography Spectroscopy XANES Jahn–Teller effect Extended X-ray absorption fine structure

Subjects

Copper compounds, Jahn-Teller effect, Solvation, XANES, EXAFS, Liquid structure, Copper compounds, Jahn-Teller effect, Solvation, XANES, EXAFS, Liquid structure, Biopolymer, Copper, Divalent cation, Physical and Theoretical Chemistry, General Physics and Astronomy

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