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

Andrey V Gavrikov; Nikolay N Efimov; Zhanna V Dobrokhotova; Andrey B Ilyukhin; Pavel N Vasilyev; Vladimir M Novotortsev

doi:10.1039/c7dt02175e

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

Dalton Trans. 2017 Sep 12;46(35):11806-11816. doi: 10.1039/c7dt02175e.

Authors

Andrey V Gavrikov¹, Nikolay N Efimov, Zhanna V Dobrokhotova, Andrey B Ilyukhin, Pavel N Vasilyev, Vladimir M Novotortsev

Affiliation

¹ N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.

PMID: 28837197
DOI: 10.1039/c7dt02175e

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 Δ_eff/k_B = 77 K under a dc field of 1500 Oe. For 8 (Yb), the anisotropy barrier is Δ_eff/k_B = 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.