Polymer Segments at the Folding Limit: Raman Scattering for the Diglyme Benchmark.
Polymer Segments at the Folding Limit: Raman Scattering for the Diglyme Benchmark.
复制标题
折叠极限下的聚合物片段:Diglyme 基准的拉曼散射
DOI:
10.1002/cphc.201701169
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Martin A. Suhm
中科院分区:
文献类型:
--
作者:
Sebastian Bocklitz;Martin A. Suhm
Methyl‐capped polyethers model flexible polar polymer chains. Their intrinsic all‐transconformational preference gives way to folded conformations if the chain is sufficiently long. We find by Raman cryospectroscopy in the gas phase and quantum chemical calculations that diglyme still prefers the stretched state, although folded variants come very close in energy. Three‐body dispersion correction or higher‐order electron correlation is important to match experiments, despite the polar character of C−O bonds. This turns oligoglymes into challenging benchmark systems for a balanced description of intra‐chain torsion and inter‐segment van der Waals attraction.
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