Three-dimensional two-fold interpenetrated Cr-III-Gd-III heterometallic framework as an attractive cryogenic magnetorefrigerant

摘要

The hydrothermal reaction of CrO3, Gd2O3 and iminodiacetic acid (H(2)IDA) yields a three-dimensional (3D) two-fold interpenetrated complex [CrGd(IDA)(2)(C2O4)](infinity) (1). The oxalate anions were generated in situ under hydrothermal conditions. Magnetic studies suggest the presence of weak antiferromagnetic coupling between Cr-III and Gd-III ions, and negligible Gd-III center dot center dot center dot Gd-III and Cr-III center dot center dot center dot Cr-III couplings. Complex 1 exhibits a large magnetocaloric effect with -Delta S-m(max) = 39.86 J kg(-1) K-1 (the mass aspect) and 93.69 mJ cm(-3) K-1 (the volumetric aspect), making it an attractive refrigerant for low-temperature applications.