Issue 20, 2010

Magnetic circular dichroism spectroscopy on the Cr8 antiferromagnetic ring

Abstract

A Magnetic Circular Dichroism (MCD) spectroscopic study of the antiferromagnetic ring [Cr8F8Piv16] (Piv = pivalate) is reported. From the splitting of the MCD bands, the single ion anisotropy parameters in the cluster spin ground state at different fields were determined to be dCr = −0.33 ± 0.02 cm−1, eCr = 0.11 ± 0.01 cm−1. Analysis of the MCD intensity as a function of field and temperature revealed the influence of spin mixing effects and yielded independent estimates of the single ion anisotropies (dCr = −0.19 cm−1, eCr = 4.3 × 10−4 cm−1), as well as yielding the isotropic exchange interaction strength (J = −6.00 cm−1). Thus it is shown that MCD is a powerful method to unravel the relation between single-ion and cluster anisotropy, furthering the design of molecular magnets with desired properties.

Graphical abstract: Magnetic circular dichroism spectroscopy on the Cr8 antiferromagnetic ring

Supplementary files

Article information

Article type
Paper
Submitted
27 Nov 2009
Accepted
05 Mar 2010
First published
26 Mar 2010

Dalton Trans., 2010,39, 4999-5004

Magnetic circular dichroism spectroscopy on the Cr8 antiferromagnetic ring

J. van Slageren, S. Piligkos and F. Neese, Dalton Trans., 2010, 39, 4999 DOI: 10.1039/B925028J

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