27Al NMR study of the metal cluster compound Al50C120H180

被引：11
|
作者：
Bono, D.
Hartig, J.
Huber, M.
Schnoeckel, H.
deJOngh, L. J.
机构：
[1] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands
[2] Univ Karlsruhe, Inst Anorgan Chem, D-76128 Karlsruhe, Germany
来源：
JOURNAL OF CLUSTER SCIENCE | 2007年 / 18卷 / 01期
关键词：
metal clusters; NMR; quadrupolar relaxation;
D O I：
10.1007/s10876-007-0111-3
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
We present an Al-27 NMR study of the metal cluster compound Al50Cp*(12) which is composed of (identical) Al-50 clusters, each surrounded by a Cp* ligand shell, and arranged in a crystalline 3D array (here Cp* = pentamethylcyclopentadienyl = C-5(CH3)(5)). The compound is found to be non-conducting, the nuclear spin-lattice relaxation in the temperature range 100-300 K being predominantly due to reorientational motions of the Cp* rings. These lead to a pronounced maximum in the relaxation rate at T similar to 170 K, corresponding to an activation energy of about 850 K. Data for the related compound Al4Cp*(4), containing very much smaller Al-4 clusters are also presented. A comparison is drawn with the quadrupolar relaxation recently observed for the non-conducting fraction of Ga-84 molecules in the metal cluster compound Ga-84[N(SiMe3)(2)](20)-Li6Br2(thf)(20)center dot 2toluene.
引用
收藏
页码：319 / 331
页数：13
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