Experimental and theoretical Raman analysis of functionalized diamantane

Experimental and theoretical Raman analysis of functionalized diamantane
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功能化金刚烷的实验和理论拉曼分析

DOI:
10.1088/0953-4075/46/2/025101
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发表时间:
2013
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
J. Maultzsch
J. Maultzsch
中科院分区:
--
文献类型:
--
作者:
R. Meinke;R. Richter;T. Möller;B.A. Tkachenko;P.R. Schreiner;C. Thomsen;J. Maultzsch

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用拉曼光谱对氨基、羟基和硫醇功能化的金刚烷进行了分析。通过支持密度泛函理论的计算对光谱中的峰进行了指认。确定了两个指纹区,用于快速确定功能化类型和位置。在他们的帮助下,我们可以区分官能团的两个不同的位置。1位官能化导致简并振动模的拉曼激活和分裂,从而导致更复杂的拉曼光谱和几个模的强烈位移。另一方面,相同模式的小移位表示4个位置的功能化。我们在官能团的质量依赖关系中观察到一个反常现象,我们将其归因于电负性对振动频率的影响。此外,我们还可以通过拉伸振动的特征带来区分官能团。
Diamantane functionalized with amino, hydroxyl and thiol groups has been analyzed by Raman spectroscopy. The peaks in the spectra were assigned by supporting density functional theory computations. Two fingerprint regions for a fast determination of functionalization type and site were identified. With their help we can distinguish two different sites of the functional group. Functionalization in the 1-position leads to Raman activation and splitting of degenerate vibrational modes and hence to a more complex Raman spectrum and strong shifts of several modes. Small shifts of the same modes, on the other hand, indicate functionalization in the 4-position. We observe an anomaly in the mass dependence of the functional group, which we assign to the influence of the electronegativity on the vibrational frequency. Additionally, we can distinguish between the functional groups by the characteristic bands of the stretch vibration.
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