An Effectively Uncoupled Gd8 Cluster Formed through Fixation of Atmospheric CO2 Showing Excellent Magnetocaloric Properties
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES（2024）
摘要
The [Gd-8(opch)(8)(CO3)(4)(H2O)(8)]4H(2)O10MeCN coordination cluster (1) crystallises in P1. The Gd-8 core is held together by four bridging carbonates derived from atmospheric CO2 as well as the carboxyhydrazonyl oxygens of the 2-hydroxy-3-methoxybenzylidenepyrazine-2-carbohydrazide (H(2)opch) Schiff base ligands. The magnetic measurements show that the Gd-III ions are effectively uncoupled as seen from the low Weiss constant of 0.05 K needed to fit the inverse susceptibility to the Curie-Weiss law. Furthermore, the magnetisation data are consistent with the Brillouin function for eight independent Gd-III ions. These features lead to a magnetocaloric effect with a high efficiency which is 89% of the theoretical maximum value.
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关键词
Schiff base,coordination cluster,gadolinium,magnetocaloric effect
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