Rotational potentials of bridging and terminal methyl groups in trimethylaluminum-dimers

被引：3
|
作者：
Prager, M
Grimm, H
Parker, SF
McGrady, S
机构：
[1] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[3] Kings Coll London, London WC2R 2LS, England
来源：
PHYSICA B-CONDENSED MATTER | 2000年 / 276卷
关键词：
molecular systems; rotational modes; tunnelling;
D O I：
10.1016/S0921-4526(99)01432-5
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Trimethylaluminum is composed of dimers linked via bridging methyl groups. Neutron spectroscopy is used to determine internal and external modes, especially rotational tunnelling. Librations of methyl groups are assigned on the basis of the isotope effect. Rotational potentials are derived. The bridging CH3 group shows the strongest potential: Steric hindrance by the five-fold coordination of its C atom overcompensates the barrier reduction by the elongated AI-C bond. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：250 / 251
页数：2
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