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Gadolinium(III)-hydroxy ladders trapped in succinate frameworks with optimized magnetocaloric effect.

Yan-Cong Chen1, Fu-Sheng Guo, Yan-Zhen Zheng

  • 1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275 (P.R. China), Fax: (+86) 20-8411-2245.

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New gadolinium coordination polymers exhibit significant cryogenic magnetocaloric effects (MCE). These high-density materials offer promising applications for advanced cooling technologies.

Keywords:
coordination polymersgadoliniummagnetic propertiesmagnetocaloric effectsuccinate

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetism

Background:

  • Gadolinium-based coordination polymers are explored for their magnetic properties.
  • The magnetocaloric effect (MCE) is crucial for developing efficient cooling technologies.

Purpose of the Study:

  • To synthesize and characterize novel inorganic-organic hybrid coordination polymers incorporating gadolinium(III)-hydroxy ladders.
  • To investigate the magnetic and thermal properties of these materials, focusing on their magnetocaloric effect.

Main Methods:

  • Synthesis of two distinct gadolinium(III)-hydroxy ladder coordination polymers with succinate ligands.
  • Magnetic susceptibility and heat capacity measurements were performed.
  • Analysis of structural and magnetic data to determine MCE performance.

Main Results:

  • Successfully synthesized two coordination polymers, [Gd2(OH)2(suc)2(H2O)]n·2nH2O (1) and [Gd6(OH)8(suc)5(H2O)2 ]n·4n H2O (2).
  • Both compounds exhibited large cryogenic magnetocaloric effects (MCE): 42.8 J kg(-1) K(-1) for complex 1 and 48.0 J kg(-1) K(-1) for complex 2 (at ΔH=70 kG).
  • High density resulted in significant volumetric MCEs of 120 mJ cm(-3) K(-1) for complex 1 and 144 mJ cm(-3) K(-1) for complex 2.

Conclusions:

  • The synthesized gadolinium coordination polymers are efficient inorganic-organic hybrid materials.
  • These materials demonstrate substantial cryogenic magnetocaloric effects, particularly in volumetric terms.
  • The findings highlight the potential of these compounds for advanced magnetic refrigeration applications.