Methyl group librations in sterically hindered dimethylnaphthalene molecules: neutron diffraction studies of 1,8-dimethylnaphthalene between 50 and 200 K
Methyl group librations in sterically hindered dimethylnaphthalene molecules: neutron diffraction studies of 1,8-dimethylnaphthalene between 50 and 200 K
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位阻二甲基萘分子中的甲基基团振动：50 至 200 K 之间 1,8-二甲基萘的中子衍射研究
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Nowell
中科院分区：
文献类型：
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作者：
Chick C. Wilson;H. Nowell
用变温单晶中子衍射法研究了1，8-二甲基萘的结构。这两个甲基位于萘环的同一侧，导致了很大的空间效应，特别是阻碍了甲基的振动。这种立体效应似乎支配着这些群的耦合运动的另一种可能性。将结果直接与相关化合物的结果进行比较
1，5-二甲基萘中不存在甲基偶联运动的可能性，而且空间位阻也较小。
The structure of 1,8-dimethylnaphthalene has been studied by variable temperature single crystal neutron diffraction. The location of the two methyl groups on the same side of the naphthalene ring leads to substantial steric effects, notably a hindering of the methyl group librations. This steric effect appears to dominate over the alternative possibility of coupled motions of these groups. The results are compared directly with those from the related compound
1,5-dimethylnaphthalene where there is no possibility of methyl group coupled motions, but also less severe steric hindrance.