Double-channel excitation in the X-ray absorption spectrum of Fe3+ water solutions

Benfatto, M.; Solera, J. A.; García, J.; Chaboy, J.

doi:10.1016/s0301-0104(02)00728-0

Cited by 51 publications

(55 citation statements)

References 23 publications

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“…In fact the intensity of this structure follows the Co 3+ content. Since the multiple attempts we made (not shown here) cannot reproduce this peak we speculate that it might be associated to a multiple excitation effect as occur in other systems [32].…”

Section: Methodsmentioning

confidence: 79%

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
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Abstract.The valence and spin state evolution of Mn and Co on TbMn 1-x Co x O 3 series is precisely determined by means of soft and hard x-ray absorption spectroscopy (XAS) and Kβ x-ray emission spectroscopy (XES). Our results show the change from Mn 3+ to Mn 4+ both high-spin (HS) together with the evolution from Co 2+ HS to Co 3+ low-spin (LS) with increasing x. In addition, high energy resolution XAS spectra on the K pre-edge region are interpreted in terms of the strong charge transfer and hybridization effects along the series. Disorder and competitive interactions lead to a magnetic glassy behaviour in these samples.

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Section: Methodsmentioning

confidence: 79%

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
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“…Whereas the Fe͑II͒ spectrum is well accounted for by a single-channel calculation, two excitation channels are needed to reproduce the Fe͑III͒ experimental spectrum. 47 This comparison points to the possibility that Cu K-edge XANES spectrum of Cu͑II͒ aquaion is due to the superposition of two different excitation channels. Moreover, a recent work performed on the Cu K edge of Cu͑II͒ complexes with N-coordinating ligands forming a square-planar arrangement around metal cation also supports this hypothesis.…”

Section: Figmentioning

confidence: 91%

“…These experimental spectra were well accounted for by single-channel MS computations. 47,48 In contrast, peak A is much wider for the Fe͑III͒ and Cu͑II͒ hydrates included in the same figure. Whereas the Fe͑II͒ spectrum is well accounted for by a single-channel calculation, two excitation channels are needed to reproduce the Fe͑III͒ experimental spectrum.…”

Section: Figmentioning

confidence: 93%

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

Chaboy

Muñoz‐Páez

Merkling

et al. 2006

The Journal of Chemical Physics

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112

125

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The long elusive structure of Cu͑II͒ 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 ͑2001͔͒, 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 ͑XANES͒ region spectrum, as already observed in other Cu͑II͒ complexes ͓Chaboy et al., Phys. Rev. B 71, 134208 ͑2005͔͒. The extended x-ray-absorption fine-structure ͑EXAFS͒ 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 Cu͑II͒ 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 Cu͑II͒ 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.

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“…7.132 keV after the first XANES resonance (white line) in the spectra presented here suggests that only a distorted octahedral coordination geometry is present. [22] All samples exhibit the same edge , but it must be kept in mind that the fit results for carbon, which is a light backscatterer, should be only used in a comparative way, and the absolute values of the coordination number are not reliable. [23] Nevertheless, the Fe-C distances are in good accordance with those of the crystalline reference 10 (Entry 2).…”

Section: Exafs/xanes Studiesmentioning

confidence: 99%

Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non‐Heme Iron Complexes

et al. 2009

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Keywords: Carboxylate ligands / EPR spectroscopy / EXAFS spectroscopy / Mössbauer spectroscopy / OxidationA series of 2,6-diacylpyridine ligand precursors 5a-d·HCl with different tether lengths between the carboxyl and pyridine moiety was prepared and converted into the correspondig trinuclear Fe 3 (µ 3 -O) complexes 8a-d and 10. Under slow precipitation conditions a tetranuclear complex 9 was isolated instead of 8a. Single-crystal X-ray diffraction analyses were performed on ligands 5a-d and complexes 9 and 10. Characterization by X-ray absorption spectroscopy (XAS) proved a trinuclear Fe 3 (µ 3 -O) core for complexes 8a-d. When complex 8a was submitted to Gif-type oxidations (O 2 , Zn, pyridine, HOAc), Mössbauer and nuclear inelastic scattering (NIS) suggested the formation of mononuclear species. The trinuclear ferric complex 10 has an isosceles molecular structure, which is manifested in the 57 Fe Mössbauer spectrum

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Double-channel excitation in the X-ray absorption spectrum of Fe3+ water solutions

Cited by 51 publications

References 23 publications

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
View full text Add to dashboard Cite

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
View full text Add to dashboard Cite

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

Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non‐Heme Iron Complexes

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Double-channel excitation in the X-ray absorption spectrum of Fe3+ water solutions

Cited by 51 publications

References 23 publications

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3Cuartero1, Lafuerza2, Rovezzi3 et al. 2016Phys. Rev. B302160View full textAdd to dashboardCite

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3Cuartero1, Lafuerza2, Rovezzi3 et al. 2016Phys. Rev. B302160View full textAdd to dashboardCite

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

Syntheses, Crystal Structures, Spectroscopic Properties, and Catalytic Aerobic Oxidations of Novel Trinuclear Non‐Heme Iron Complexes

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Product

Resources

About

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
View full text Add to dashboard Cite

X-ray absorption and emission spectroscopy study of Mn and Co valence and spin states inTbMn1−xCoxO3
Cuartero
¹
,
Lafuerza
²
,
Rovezzi
³

et al. 2016
Phys. Rev. B
30
2
16
0
View full text Add to dashboard Cite