1. Anion-Templated Assembly and Magnetocaloric Properties of a Nanoscale {Gd38} Cage versus a {Gd48} Barrel.
- Author
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Guo, Fu‐Sheng, Chen, Yan‐Cong, Mao, Ling‐Ling, Lin, Wei‐Quan, Leng, Ji‐Dong, Tarasenko, Róbert, Orendáč, Martin, Prokleška, Jan, Sechovský, Vladimír, and Tong, Ming‐Liang
- Subjects
SPECTRUM analysis ,CRYSTALLOGRAPHY ,INFRARED spectroscopy ,PROPERTIES of matter ,LINE geometry ,CRYSTAL lattices ,LATTICE theory ,MINERALOGY - Abstract
The comprehensive study reported herein provides compelling evidence that anion templates are the main driving force in the formation of two novel nanoscale lanthanide hydroxide clusters, {Gd
38 (ClO4 )6 } ( 1) and {Gd48 Cl2 (NO3 )} ( 2), characterized by single-crystal X-ray crystallography, infrared spectroscopy, and magnetic measurements. {Gd38 (ClO4 )6 }, encapsulating six ClO4 − ions, features a cage core composed of twelve vertex-sharing {Gd4 } tetrahedrons and one Gd⋅⋅⋅Gd pillar. When Cl− and NO3 − were incorporated in the reaction instead of ClO4 − , {Gd48 Cl2 (NO3 )} is obtained with a barrel shape constituted by twelve vertex-sharing {Gd4 } tetrahedrons and six {Gd5 } pyramids. What is more, the cage-like {Gd38 } can be dynamically converted into the barrel-shaped {Gd48 } upon Cl− and NO3 − stimulus. To our knowledge, it is the first time that the linear M-O-M′ fashion and the unique μ8 -ClO4 − mode have been crystallized in pure lanthanide complex, and complex 2 represents the largest gadolinium cluster. Both of the complexes display large magnetocaloric effect in units of J kg−1 K−1 and mJ cm−3 K−1 on account of the weak antiferromagnetic exchange, the high NGd / MW ratio (magnetic density), and the relatively compact crystal lattice (mass density). [ABSTRACT FROM AUTHOR]- Published
- 2013
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