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Periodic trends and hidden dynamics of magnetic properties in three series of triazacyclononane lanthanide complexes

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Abstract

In three structurally related series of nine-coordinate lanthanide(III) complexes (Ln = Tb, Dy, Ho, Er, Tm and Yb) based on triazacyclononane, solution NMR studies and DFT/CASSCF calculations have provided key information on the magnetic susceptibility anisotropy. Both experimental and computational approaches have revealed a poor correlation to Bleaney's theory of magnetic anisotropy. CASSCF calculations suggested that the magnetic susceptibility is very sensitive to small geometric variations within the first coordination sphere, whereas DFT analyses indicate that it is the thermal accessibility of low energy vibrational modes that may lead to distortion. Parallel NMRD and EPR studies on the three Gd(III) complexes revealed good correspondence in estimating the electronic relaxation time. The Gd(III) tris-pyridinecarboxylate complex possesses a very long electronic relaxation time making it a promising starting point for responsive gadolinium EPR probe design.

Graphical abstract: Periodic trends and hidden dynamics of magnetic properties in three series of triazacyclononane lanthanide complexes

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Publication details

The article was received on 11 Mar 2019, accepted on 15 May 2019 and first published on 15 May 2019


Article type: Paper
DOI: 10.1039/C9DT01069F
Dalton Trans., 2019, Advance Article

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    Periodic trends and hidden dynamics of magnetic properties in three series of triazacyclononane lanthanide complexes

    E. A. Suturina, K. Mason, M. Botta, F. Carniato, I. Kuprov, N. F. Chilton, E. J. L. McInnes, M. Vonci and D. Parker, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT01069F

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