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Issue 35, 2017
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Novel mononuclear Ln complexes with pyrazine-2-carboxylate and acetylacetonate co-ligands: remarkable single molecule magnet behavior of a Yb derivative

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Abstract

A series of novel isomorphic mononuclear complexes [Ln(PyrCOO)(acac)2(H2O)2] (Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), Tm (7), Yb (8), Y(9); acac – acetylacetonate (pentane-2,4-dionate) anion, PyrCOOH is pyrazine-2-carboxylic acid) were prepared. Slow magnetic relaxation indicating SMM behavior was found in complexes 3, 4, 6 and 8. For 4 (Dy), the anisotropy barrier is Δeff/kB = 77 K under a dc field of 1500 Oe. For 8 (Yb), the anisotropy barrier is Δeff/kB = 54 K under a dc field of 2000 Oe which is the highest presently known value for molecular Yb carboxylate complexes and for Yb molecular complexes in general.

Graphical abstract: Novel mononuclear Ln complexes with pyrazine-2-carboxylate and acetylacetonate co-ligands: remarkable single molecule magnet behavior of a Yb derivative

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The article was received on 15 Jun 2017, accepted on 01 Aug 2017 and first published on 01 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02175E
Citation: Dalton Trans., 2017,46, 11806-11816
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    Novel mononuclear Ln complexes with pyrazine-2-carboxylate and acetylacetonate co-ligands: remarkable single molecule magnet behavior of a Yb derivative

    A. V. Gavrikov, N. N. Efimov, Z. V. Dobrokhotova, A. B. Ilyukhin, P. N. Vasilyev and V. M. Novotortsev, Dalton Trans., 2017, 46, 11806
    DOI: 10.1039/C7DT02175E

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