Assigning a structural motif using spontaneous molecular dipole orientation in thin films.
Assigning a structural motif using spontaneous molecular dipole orientation in thin films.
复制标题
使用薄膜中的自发分子偶极子取向分配结构基序。
DOI:
10.1039/c8cp06010j
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Roman M
中科院分区:
文献类型:
--
作者:
Roman M
Spontaneous orientation of molecular dipoles has been observed to produce bulk electric fields, termed ‘spontelectric’ fields, in a broad variety of molecular solid thin films formed by condensation from the gas phase. Such spontelectric fields are found in cis-methyl formate (cis-MF) and the present work combines observation of these fields with high quality ab initio studies of cis-MF monomers and dimers. This enables a prediction of the structural motif within the unit cell of the crystalline phase of solid cis-MF, showing it to be a non-polar dimer. Dimer formation at deposition temperatures of >90 K is therefore cited to contribute to the observed collapse of the spontelectric field at these temperatures. This is the first time that such a structural prediction has been made using observations of spontelectric behaviour as a key indicator.
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