Mixed-valent Mn supertetrahedra and planar discs as enhanced magnetic coolers

被引：205

作者：

Manoli, Maria ^{[2
]}

Collins, Anna ^{[2
]}

Parsons, Simon ^{[2
]}

Candini, Andrea ^{[2
]}

Evangelisti, Marco ^{[1
]}

Brechin, Euan K. ^{[2
]}

机构：

[1] CNR, INFM, Natl Res Ctr NanoStruct & BioSyst Surfaces, I-41100 Modena, Italy

[2] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 33期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1021/ja802829d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The syntheses and structures of two decametallic mixed-valent Mn supertetrahedra using 2-amino-2-methyl-1,3-propanediol (ampH(2)), two decametallic mixed-valent Mn planar discs using 2-amino-2-methyl-1,3-propanediol (ampH(2)) and 2-amino-2-ethyl-1,3-propanediol (aepH(2)), and a tetradecametallic mixed-valent Mn planar disc using pentaerythritol (H(4)peol) are reported. The decametallic complexes display dominant ferromagnetic exchange and spin ground states of S = 22, and the tetradecametallic complex displays dominant antiferromagnetic exchange and a spin ground state of S = 7 +/- 1. All display large (the former) and enormous (the latter) magnetocaloric effect-the former as a result of negligible zero-field splitting of the ground state, and the latter as a result of possessing a high spin-degeneracy at finite low temperatures-making them the very best cooling refrigerants for low-temperature applications.

引用

页码：11129 / 11139

页数：11

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