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  4. X-ray Magnetic Circular Dichroism (XMCD) Study of a Methoxide-Bridged Dy^III-Cr^III Cluster Obtained by Fluoride Abstraction from cis-[Cr^III F_2 (phen)_2]^+
 
research article

X-ray Magnetic Circular Dichroism (XMCD) Study of a Methoxide-Bridged Dy^III-Cr^III Cluster Obtained by Fluoride Abstraction from cis-[Cr^III F_2 (phen)_2]^+

Dreiser, Jan  
•
Pedersen, Kasper S.
•
Birk, Torben
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2012
The Journal of Physical Chemistry A

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 LnF(3) and methoxide-bridged Cr-Ln clusters (Ln = Nd (1), Tb (2), Dy (3)) of formula [Cr-III(phen)(2)(mu-MeO)(2)Ln-(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 m(J) = +/- 13/2, and the first excited doublet is found to be m(J) = +/- 11/2 at an energy of delta = 57(21) cm(-1). The Cr-III ion exhibits a uniaxial anisotropy of D-Cr = 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.

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Type
research article
DOI
10.1021/jp303512a
Web of Science ID

WOS:000306988700009

Author(s)
Dreiser, Jan  
Pedersen, Kasper S.
Birk, Torben
Schau-Magnussen, Magnus
Piamonteze, Cinthia
Rusponi, Stefano  
Weyhermüller, Thomas
Brune, Harald  
Nolting, Frithjof
Bendix, Jesper
Date Issued

2012

Publisher

Amer Chemical Soc

Published in
The Journal of Physical Chemistry A
Volume

116

Issue

30

Start page

7842

End page

7847

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LNS  
Available on Infoscience
August 15, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/84574
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