富勒烯C60/anthracene加合物的红外光谱
Infrared spectroscopy of fullerene C60/anthracene adducts
摘要：
最近斯皮策太空望远镜对行星状星云、反射星云和北冕座R星等几种天体物理环境的观测显示，中性富勒烯分子同时存在中红外特征（即，C60）和多环芳烃（PAHs）。如果C60富勒烯和多环芳烃共存于富含富勒烯的太空环境中，那么C60可以很容易地与许多不同的多环芳烃分子形成加合物;至少与下缩合的多环芳烃形成加合物。在这里，我们提出了实验室红外光谱（~2-25 μ m）的C60富勒烯和蒽Dies-Alder单，双加合物，通过声化学合成。我们发现，C60/蒽Diels-Alder加合物显示出与C60（和C70）富勒烯和其他未识别的红外发射特征非常相似的光谱特征。因此，富勒烯加合物-如果在天体物理条件下形成，并且足够稳定/丰富-可能有助于在含富勒烯的拱星/星际环境中观察到的红外发射特征。
英文摘要：
Recent Spitzer Space Telescope observations of several astrophysical environments such as Planetary Nebulae, Reflection Nebulae, and R Coronae Borealis stars show the simultaneous presence of mid-infrared features attributed to neutral fullerene molecules (i.e., C60) and polycyclic aromatic hydrocarbons (PAHs). If C60 fullerenes and PAHs coexist in fullerene-rich space environments, then C60 may easily form adducts with a number of different PAH molecules; at least with catacondensed PAHs. Here we present the laboratory infrared spectra (~2-25 um) of C60 fullerene and anthracene Dies-Alder mono- and bis-adducts as produced by sonochemical synthesis. We find that C60/anthracene Diels-Alder adducts display spectral features strikingly similar to those from C60 (and C70) fullerenes and other unidentified infrared emission features. Thus, fullerene-adducts - if formed under astrophysical conditions and stable/abundant enough - may contribute to the infrared emission features observed in fullerene-containing circumstellar/interstellar environments.
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