Identifying the Conformational Isomers of Single-Molecule Cyclohexane at Room Temperature
作者:Chun Tang、Yongxiang Tang、Yiling Ye、Zhewei Yan、Zhixin Chen、Lijue Chen、Longyi Zhang、Junyang Liu、Jia Shi、Haiping Xia、Wenjing Hong
DOI:10.1016/j.chempr.2020.07.024
日期:2020.10
challenge. Here, we develop a single-molecule approach to identify the conformational isomers of cyclohexane at room temperature through the single-molecule electrical characterization. By noise analysis and feature extraction of the conductance of single-molecule junctions, we quantificationally identified two chair isomers of cyclohexane at room temperature, while such identification is only feasible at
异构反映了具有相同分子式的分子显示不同结构的普遍性。由于约10 kcal mol -1的低势垒,柔性分子的构象异构体之间的相互转化非常快,导致以集合方法为特征的所有可能异构体贡献的平均信号。因此,在室温下鉴定柔性分子的构象异构体具有很大的挑战。在这里,我们开发了一种单分子方法,通过单分子电特征鉴定室温下环己烷的构象异构体。通过噪声分析和单分子连接电导的特征提取,我们定量地鉴定了室温下环己烷的两个椅子异构体,而这种鉴定仅在低温下通过整体表征是可行的。