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Issue 24, 2013
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Crystal structure diversity in the bis[hydrotris(3,5-dimethylpyrazolyl)borate]iodouranium(III) complex: from neutral to cationic forms

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Abstract

The iodouranium(III) complex with two hydrotris(3,5-dimethylpyrazolyl)borate ligands is shown to adopt three closely related forms in the solid state. In addition to the previously reported structure for [U(TpMe2)2I], in which one of the pyrazolyl rings coordinates side-on to the U atom, another structure incorporating solvent molecules presents undistorted pyrazol rings, and a third one is the ionic compound [U(TpMe2)2]I. The implications of this structural diversity for the recently reported single ion magnet behaviour in this complex are discussed, namely on the basis of quantum chemistry calculations. The main effect of the bonding of the iodine atom to uranium is the increase of the size of the first coordination sphere and lowering of the symmetry of the molecule, resulting in a smaller crystal field splitting.

Graphical abstract: Crystal structure diversity in the bis[hydrotris(3,5-dimethylpyrazolyl)borate]iodouranium(iii) complex: from neutral to cationic forms

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Publication details

The article was received on 20 Mar 2013, accepted on 15 Apr 2013 and first published on 15 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT50753J
Citation: Dalton Trans., 2013,42, 8861-8867
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    Crystal structure diversity in the bis[hydrotris(3,5-dimethylpyrazolyl)borate]iodouranium(III) complex: from neutral to cationic forms

    M. A. Antunes, I. C. Santos, H. Bolvin, L. C. J. Pereira, M. Mazzanti, J. Marçalo and M. Almeida, Dalton Trans., 2013, 42, 8861
    DOI: 10.1039/C3DT50753J

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