Electronic and Vibrational Properties of Diamondoid Oligomers

Electronic and Vibrational Properties of Diamondoid Oligomers
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金刚石低聚物的电子和振动特性

DOI:
10.1021/acs.jpcc.7b07666
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发表时间:
2017
影响因子:
3.7
通讯作者:
J. Maultzsch
J. Maultzsch
中科院分区:
化学3区
文献类型:
--
作者:
C. Tyborski;R. Gillen;A.A. Fokin;T.V. Koso;H. Hausmann;N.A. Fokina;V.N. Rodionov;P.R. Schreiner;C. Thomsen;J. Maultzsch

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利用共振拉曼光谱分析了类金刚石齐聚物的振动和电子性质。这些化合物由较低的金刚烷或金刚烷组成,它们通过双键相互连接。因此,所有齐聚物都具有类乙烯中心,强烈地影响着光学跃迁的性质。双键将HOMO(最高占据分子轨道)定位在类金刚石之间,并伴随着光学跃迁能的显着降低。将这些化合物的拉曼光谱与原始的类金刚石相比较,我们发现了几个源于乙烯基团的特征模式。在密度泛函理论(DFT)计算的支持下,我们将这些模式归因于高度局域振动,这种高度局域振动可以部分来源于母体乙烯的振动模式。我们进一步观察到化合物中的两个新的拉曼模式:一个是二聚体的呼吸模,另一个是整个乙烯部分的转动模。
We analyzed the vibrational and electronic properties of diamondoid oligomers via resonance Raman spectroscopy. The compounds consist of lower diamondoids such as adamantane or diamantane that are interconnected with double bonds. Therefore, all oligomers have ethylene-like centers strongly influencing the character of the optical transitions. The double bond localizes the HOMO (highest occupied moluecular orbital) in between the diamondoids accompanied by a significant decrease of optical transition energies. Comparing Raman spectra of the compounds to pristine diamondoids, we find several characteristic modes originating from the ethylene moieties. Supported by DFT (density functional theory) computations, we attribute these modes to highly localized vibrations that can partially be derived from the vibrational modes of parent ethylene. We further observe two new Raman modes in the compounds: a dimer breathing mode and a rotational mode of the entire ethylene moieties.
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