Home
Resources
Publications
X-ray Magnetic Circular Dichroism (XMCD) Study of a Methoxide-Bridged Dy(III)-Cr(III) Cluster Obtained by Fluoride Abstraction From cis-[Cr(III)F2(phen)2](+)

X-ray Magnetic Circular Dichroism (XMCD) Study of a Methoxide-Bridged Dy(III)-Cr(III) Cluster Obtained by Fluoride Abstraction From cis-[Cr(III)F2(phen)2](+)

Jan Dreiser, Kasper S Pedersen, Torben Birk, Magnus Schau-Magnussen, Cinthia Piamonteze, Stefano Rusponi, Thomas Weyhermüller, Harald Brune, Frithjof Nolting, Jesper Bendix

J Phys Chem A. 2012 Aug 2;116(30):7842-7.

PMID: 22788870

Abstract:

An isostructural series of dinuclear chromium(III)-lanthanide(III) clusters is formed by fluoride abstraction of cis-[CrF2(phen)2](+) by Ln(3+) resulting in LnF3 and methoxide-bridged Cr-Ln clusters (Ln = Nd (1), Tb (2), Dy (3)) of formula [Cr(III)(phen)2(μ-MeO)2Ln(NO3)4]·xMeOH (x = 2-2.73). In contrast to fluoride, methoxide bridges in a nonlinear fashion, which facilitates chelation. For 3, X-ray magnetic circular dichroism (XMCD) provides element-specific magnetization curves that are compared to cluster magnetization and susceptibility data acquired by SQUID magnetometry. The combination of XMCD and SQUID is able to resolve very small magnetic coupling values and reveals a weak Cr(III)-Dy(III) coupling of j = -0.04(3) cm(-1). The Dy(III) ion has a ground-state Kramers doublet of mJ = ±13/2, and the first excited doublet is found to be mJ = ±11/2 at an energy of δ = 57(21) cm(-1). The Cr(III) ion exhibits a uniaxial anisotropy of DCr = -1.7(1.0) cm(-1). Further, we observe that a weak anisotropic coupling of dipolar origin is sufficient to model the data, suggesting that methoxide bridges do not play a significant role in the magnetic coupling for the present systems.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13569807	Dysprosium(III) fluoride		13569-80-7	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: