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Issue 34, 2011
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Modification of the magnetic properties of a heterometallic wheel by inclusion of a Jahn–Teller distorted Cu(II) ion

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Abstract

An investigation into the physical consequences of including a Jahn–Teller distorted CuII ion within an antiferromagnetically coupled ring, [R2NH2][Cr7CuF8((O2CtBu)16)] is reported. Inelastic neutron scattering (INS) and electron paramagnetic resonance (EPR) spectroscopic data are simulated using a microscopic spin Hamiltonian, and show that the two Cr–Cu exchange interactions must be inequivalent. One Cr–Cu exchange is found to be antiferromagnetic and the other ferromagnetic. The geometry of the Jahn–Teller elongation is deduced from these results, and shows that a Jahn–Teller elongation axis must lie in the plane of the Cr7Cu wheel; the elongation is not observed by X-ray crystallography, due to positional disorder of the Cu site within the wheel. An electronic structure calculation confirms the structural distortion of the Cu site.

Graphical abstract: Modification of the magnetic properties of a heterometallic wheel by inclusion of a Jahn–Teller distorted Cu(ii) ion

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Publication details

The article was received on 31 Mar 2011, accepted on 17 May 2011 and first published on 05 Jul 2011


Article type: Paper
DOI: 10.1039/C1DT10547G
Citation: Dalton Trans., 2011,40, 8533-8539
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    Modification of the magnetic properties of a heterometallic wheel by inclusion of a Jahn–Teller distorted Cu(II) ion

    M. L. Baker, S. Piligkos, A. Bianchi, S. Carretta, D. Collison, J. J. W. McDouall, E. J. L. McInnes, H. Mutka, G. A. Timco, F. Tuna, P. Vadivelu, H. Weihe, H. U. Güdel and R. E. P. Winpenny, Dalton Trans., 2011, 40, 8533
    DOI: 10.1039/C1DT10547G

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