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Issue 3, 2015
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Synthesis, structure, and magnetism of non-planar heptanuclear lanthanide(III) complexes

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Abstract

The reaction of the hydrazone, 2-methoxy-6-(pyridin-2-yl-hydrazonomethyl) phenol (LH) with lanthanide(III) nitrate salts in the presence of excess triethylamine afforded the heptanuclear Ln(III) complexes: [Gd7(L)63-OH)8(NO3)4(H2O)]·(NO3)3·8CH3CN·H2O (1), [Tb7(L)63-OH)8(NO3)4]·(NO3)3·9CH3CN·2CH3OH·3H2O (2), [Dy7(L)63-OH)8(NO3)4(H2O)]·(NO3)3·7CH3CN·3H2O (3), [Ho7(L)63-OH)8(NO3)4]·(NO3)3·11CH3CN·2CH3OH·2H2O (4) and [Er7(L)63-OH)8(NO3)4]·(NO3)3·8CH3CN·2CH3OH (5). Single crystal X-ray diffraction studies reveal that these complexes are tri-cationic, possessing three nitrate counter anions. The heptanuclear ensemble is non-planar and consists of six [L] and eight μ3-OH ligands. These compounds show an interesting structural motif with two incomplete cubes fused to each other through a common Ln(III) ion. Compound 1 exhibits a magnetocaloric effect, with (−ΔSm(T) = 27.7 J kg−1 K−1 at 3 K and under a field change of 0–7 T), while compound 3 shows slow magnetic relaxation at very low temperatures.

Graphical abstract: Synthesis, structure, and magnetism of non-planar heptanuclear lanthanide(iii) complexes

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Publication details

The article was received on 30 May 2014, accepted on 05 Nov 2014 and first published on 05 Nov 2014


Article type: Paper
DOI: 10.1039/C4DT01603C
Citation: Dalton Trans., 2015,44, 1142-1149
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    Synthesis, structure, and magnetism of non-planar heptanuclear lanthanide(III) complexes

    J. Goura, J. P. S. Walsh, F. Tuna and V. Chandrasekhar, Dalton Trans., 2015, 44, 1142
    DOI: 10.1039/C4DT01603C

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