Synthesis, structure, and magnetic properties of the single-molecule magnet [Ni21(Cit)12(OH)10(H2O)10]16-

被引：130

作者：

Ochsenbein, ST

Murrie, M

Rusanov, E

Stoeckli-Evans, H

Sekine, C

Güdel, HU

机构：

[1] Univ Bern, Dept Chem & Biochem, CH-3000 Bern 9, Switzerland

[2] Univ Neuchatel, Inst Chim, CH-2000 Neuchatel, Switzerland

[3] CNRS, CRTBT, F-38042 Grenoble 9, France

[4] Muroran Inst Technol, Dept Elect & Elect Engn, Muroran, Hokkaido 0508585, Japan

来源：

INORGANIC CHEMISTRY | 2002年 / 41卷 / 20期

关键词：

D O I：

10.1021/ic020252w

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The preparation of two new compounds containing the cluster [Ni-21(cit)(12)(OH)(10)(H2O)(10)](16-) is presented, together with a detailed magnetic investigation of one of the compounds. We found that this cluster shows an unexpected stability and that it exists as different stereoisomers. Compound 1 contains the achiral cluster with a Delta-Lambda configuration, and compound 2 contains a pair of enantiomeric clusters with the configurations Delta-Delta and Lambda-Lambda, respectively. Magnetic measurements of 1 in the millikelvin range were necessary to determine the spin ground state of S = 3, and they also revealed a magnetic anisotropy within the ground state. A frequency-dependent out-of-phase signal was found in alternating current susceptibility measurements at very low temperatures, which indicates a slow relaxation of the magnetization. Thus, individual molecules are acting as single magnetic units, which is a rare phenomenon for nickel clusters. The energy barrier exhibited by compound 1 has been calculated to be 2.9 K.

引用

页码：5133 / 5140

页数：8

共 41 条

[1] Inelastic neutron scattering and magnetic susceptibilities of the single-molecule magnets [Mn4O3X(OAc)3(dbm)3] (X = Br, Cl, OAc, and F):: Variation of the anisotropy along the series [J].