A cookbook for the investigation of coordination polymers by transition metal <i>K</i>-edge XMCD

N'Diaye, Adama; Bordage, Amélie; Nataf, Lucie; Baudelet, F.; Moreno, Thierry; Bleuzen, Anne

doi:10.1107/s1600577521004884

Cited by 4 publications

(16 citation statements)

References 61 publications

(102 reference statements)

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“…X-ray Absorption spectra and XMCD signals were recorded at the Mn, Fe, Co, Ni, and Cu K-edges in the transmission mode using the dispersive setup of the ODE beamline at SOLEIL (Gif sur Yvette, France). The measurements and normalization procedure are presented and discussed in details in ref , and we recall here only the main information. We used a Si(311) polychromator in order to get a high resolution in the white line region of the spectra.…”

Section: Methodsmentioning

confidence: 99%

“…Attenuators of appropriate thickness were placed before the sample to avoid radiation damage. A metallic foil was recorded at each edge for energy calibration . The circular polarization rate is identical for all the edges.…”

Section: Methodsmentioning

confidence: 99%

“…The circular polarization rate is identical for all the edges. The XANES spectra and XMCD signals were normalized as described in ref . Like for the X-ray absorption spectra from SAMBA, they are represented as a function of E – E 0 , with the same definition of E 0 .…”

Section: Methodsmentioning

confidence: 99%

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Toward Quantitative Magnetic Information from Transition Metal K-Edge XMCD of Prussian Blue Analogs

et al. 2022

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Two series of Prussian blue analogs (PBA) were used as model compounds in order to disentangle the information contained in X-ray Magnetic Circular Dichroism (XMCD) at the K-edges of transition metals. The number of 3d electrons on one site of the bimetallic cyanide polymer has been varied by associating to the [Fe(CN) 6 ] 3or the [Cr(CN) 6 ] 3precursors various divalent metal ions A 2+ (Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ and Cu 2+ ). The compounds were studied by X-ray diffraction and SQUID magnetometry, as well as by X-ray absorption spectroscopy and XMCD at the K-edges of the A 2+ transition metal ion. The study shows that the 1s → 4p contribution to the A K-edge XMCD signal can be related to the electronic structure and the magnetic behavior of the probed A 2+ ion: the shape of the signal to the filling of the 3d orbitals, the sign of the signal to the direction of the magnetic moment with respect to the applied magnetic field, the intensity of the signal to the total spin number S A and the area under curve to the Curie constant C A . The whole study hence demonstrates that PBAs are particularly well adapted for understanding the information contained in the transition metals K-edge XMCD signals. It also offers new perspectives towards the full disentangling of the information contained in these signals and access to new insights into materials magnetic properties.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Toward Quantitative Magnetic Information from Transition Metal K-Edge XMCD of Prussian Blue Analogs

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“…Its development for PBAs was not straightforward, especially since very few groups endeavored to fundamentally understand the physical processes at the origin of the signals and make TM K-edge XMCD accessible and a routine technique for the investigation of PBA and other molecular compounds. Almost 30 years have passed since the first qualitative interpretation for the determination of the nature of the exchange coupling between the two TM ions [68] to first promising results [80,81] that will undoubtedly lead to unambiguous clear relationship between the magnetic behavior of the probed TM and the spectral features of TM K-edge XMCD.…”

Section: Discussionmentioning

confidence: 99%

“…We first addressed the effects of the external parameters on the XMCD signal [80,81]. A true understanding of the physical effects at the origin of TM K-edge XMCD can indeed be gained only if any change observed in the XMCD signal can be unambiguously attributed to a change in the internal parameter of the PBA model compounds under consideration, without a doubt about the data treatment or the experimental conditions used to record the TM K-edge XMCD signals.…”

Section: Towards a Full Understanding Of Tm K-edge Xmcdmentioning

confidence: 99%

Prussian Blue analogs and transition metal K-edge XMCD: a longstanding friendship

Bordage¹,

N'Diaye²,

Bleuzen³

2022

Comptes Rendus. Chimie

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Prussian Blue analogs (PBAs) are well-known coordination polymers offering a wide range of properties, and their fundamental understanding requires their investigations by various techniques. One of them is transition metal (TM) K-edge X-ray Magnetic Circular Dichroism (XMCD), which is element selective, bulk sensitive and compatible with a wide range of experimental conditions. This short review presents the reciprocal investigation of PBA with TM K-edge XMCD, from the first studies demonstrating that qualitative local magnetic information could be obtained on PBA from TM K-edge XMCD until our on-going project aiming at fundamentally understanding TM K-edge XMCD thanks to PBAs as model-compounds.

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Interplay between Transition-Metal K-edge XMCD and Magnetism in Prussian Blue Analogs

et al. 2022

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To disentangle the information contained in transition-metal K-edge X-ray magnetic circular dichroism (XMCD), two series of Prussian blue analogs (PBAs) were investigated as model compounds. The number of 3d electrons and the magnetic orbitals have been varied on both sites of the bimetallic cyanide polymer by combining with the hexacyanoferrate or the hexacyanochromate entities’ various divalent metal ions A2+ (Mn2+, Fe2+, Co2+, Ni2+, and Cu2+). These PBA were studied by Fe and Cr X-ray absorption spectroscopy and XMCD. The results, compared to those obtained at the A K-edges in a previous work, show that transition-metal K-edge XMCD is very sensitive to orbital symmetry and can therefore give valuable information on the local structure of the magnetic centers. Expressions of the intensity of the main 1s → 4p contribution to the signal are proposed for all K-edges and all compounds. The results pave the way toward a new tool for molecular materials able to give access to valuable information on the local orientation of the magnetic moments or to better understand the role of 4p orbitals involved in their magnetic properties.

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A cookbook for the investigation of coordination polymers by transition metal K-edge XMCD

Cited by 4 publications

References 61 publications

Toward Quantitative Magnetic Information from Transition Metal K-Edge XMCD of Prussian Blue Analogs

Toward Quantitative Magnetic Information from Transition Metal K-Edge XMCD of Prussian Blue Analogs

Prussian Blue analogs and transition metal K-edge XMCD: a longstanding friendship

Interplay between Transition-Metal K-edge XMCD and Magnetism in Prussian Blue Analogs

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