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A new family of decanuclear Ln7Cr3 clusters exhibiting a magnetocaloric effect.

ABSTRACT: Two dimeric Ln-Cr clusters with formula {Ln(H2O)8[Ln6Cr3(L)6(CH3COO)6(μ3-OH)12(H2O)12]}·(ClO4)6·xH2O (Ln = Gd, x = 35 for 1 and Ln = Dy, x = 45 for 2, HL = 2-pyrazinecarboxylic acid) were obtained by a ligand-controlled hydrolytic method with a mixed ligand system (2-pyrazinecarboxylic acid and acetate). Single crystal structure analysis showed that two trigonal bipyramids of [Gd3Cr2(μ3-OH)6]9+ worked as building blocks in constructing the metal-oxo cluster core of [Gd6Cr3(μ3-OH)12]15+ by sharing a common top - a Cr3+ ion. Additionally, compound 1 forms a three-dimensional framework with a one-dimensional nanopore channel along the a-axis through a hydrogen-bond interaction between the cationic cluster core and the free mononuclear cation [Gd(H2O)8]3+ and the π-bond interactions of the pyrazine groups on the two cationic cluster cores. Magnetic calculations indicated a weak ferromagnetic coupling interaction for Gd⋯Gd and Gd⋯Cr in compound 1, with its magnetic entropy change (-ΔS m) reaching 21.1 J kg-1 K-1 at 5 K, 7 T, while compound 2 displayed an obvious frequency-dependency at H dc = 2000 Oe.

SUBMITTER: Yin JJ 

PROVIDER: S-EPMC9033162 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature

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A new family of decanuclear Ln<sub>7</sub>Cr<sub>3</sub> clusters exhibiting a magnetocaloric effect.

Yin Jia-Jia JJ   Lu Tian-Qi TQ   Chen Cheng C   Shi Hai-Yan HY   Zhuang Gui-Lin GL   Zheng Jun J   Fang Xiaolong X   Zheng Xiu-Ying XY  

RSC advances 20210512 28

Two dimeric Ln-Cr clusters with formula {Ln(H<sub>2</sub>O)<sub>8</sub>[Ln<sub>6</sub>Cr<sub>3</sub>(L)<sub>6</sub>(CH<sub>3</sub>COO)<sub>6</sub>(μ<sub>3</sub>-OH)<sub>12</sub>(H<sub>2</sub>O)<sub>12</sub>]}·(ClO<sub>4</sub>)<sub>6</sub>·<i>x</i>H<sub>2</sub>O (Ln = Gd, <i>x</i> = 35 for 1 and Ln = Dy, <i>x</i> = 45 for 2, HL = 2-pyrazinecarboxylic acid) were obtained by a ligand-controlled hydrolytic method with a mixed ligand system (2-pyrazinecarboxylic acid and acetate). Single crystal stru  ...[more]

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