Tetranuclear lanthanide(III) complexes in a seesaw geometry: Synthesis, structure, and magnetism

Joydeb Goura, James P S Walsh, Floriana Tuna, Vadapalli Chandrasekhar

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The reaction of 2-methoxy-6-(pyridin-2-ylhydrazonomethyl)phenol (LH) with Ln(III) (Ln = Gd, Tb, Dy, Ho) salts in the presence of an excess of triethylamine afforded [Gd4(L)4(μ4-OH) (μ3-OH)2(NO3)4]·(NO 3)·4CH3CN·CH3OH·2H 2O (1), [Tb4(L)4(μ4-OH) (μ3-OH)2(NO3)4]·(NO 3)·4CH3CN·3H2O (2), [Dy 4(L)4(μ4-OH)(μ3-OH) 2(NO3)4]·(NO3) ·6CH3CN·H2O (3), and [Ho4(L) 4(μ4-OH)(μ-OH)2(NO3) 4]·(NO3)·8CH3CN·3CH 3OH·2H2O (4). All four complexes contain a monocationic tetranuclear core with a unique seesaw topology. The tetranuclear assembly is formed through the coordination of four [L]-, one μ4-OH, two μ3-OH, and four chelating nitrate ligands, with a charge-balancing nitrate counteranion. Magnetic studies reveal a weak antiferromagnetic coupling throughout the series. Compound 1 can be modeled well with an isotropic exchange between all centers parametrized by J = -0.09 cm-1. Compound 3 exhibits slow magnetic relaxation at low temperatures. © 2014 American Chemical Society.
    Original languageEnglish
    Pages (from-to)3385-3391
    Number of pages6
    JournalInorganic Chemistry: including bioinorganic chemistry
    Volume53
    Issue number7
    DOIs
    Publication statusPublished - 7 Apr 2014

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