每周分子 | Molecule of the Week
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每周分子:六苯并蔻
Molecule of the Week:
Hexa-peri-benzocoronene
六苯并蔻(Hexa-peri-benzocoronene [HBC],或更常被称为hexabenzocoronene)是一种平面的多环芳烃(PAH)。从结构上看,它由一个中心苯环组成,首先被另外六个苯环包围,形成晕苯(coronene),而晕苯又被另外六个苯环包围,总共有13个环。HBC具有D6h对称性。
1958年有两种HBC的合成方法被报道。其中,European Research Associates (布鲁塞尔)的A.Halleux、R.H.Martin和G.S.D.King使用两个反应来制备该分子:六苯基苯的脱氢环化,以及dibenz-1,9;2,3-anthrone与Zn/ZnCl2的反应。他们还从Zn/ZnCl2参与的反应中分离出了两种新的碳氢化合物。
在另一种合成中,格拉斯哥大学(University of Glasgow)的E.Clar和C.T.Ironside首先用溴处理2,3,7,8-dibenzoperinaphthene,然后加热溴化产物形成tetrabenzoperopyrene (TBP)进一步加热TBP脱氢生成HBC。作者还报道了HBC在低温固体溶液中会发出橙黄色的磷光。
2014年,德国埃尔朗根-纽伦堡大学(University of Erlangen-Nuremberg)的Andreas Hirsch及其合作者合成了一种化合物,其中HBC与buckminsterfullerene共价连接。作者指出,这种 “dyad” 可以作为光电应用的通用模板。X射线结晶学表明,两个芳香组分之间的键距仅为3.17 Å。
在另一个HBC及其衍生物与其他化学结构相结合的例子中,费德里科圣玛利亚理工大学(智利圣地亚哥)的Aleksey E. Kuznetsov将HBCs与反芳香性硫和硒核修饰的卟啉(isophlorins)配对。在这个理论研究中,作者发现isophlorins对dyads的结构和电子性质有深远的影响,因此也可能影响它们的反应。
虽然与HBC类似的多环芳烃是已知的致癌物,但其致癌性尚未有文献报道。
六苯并蒄信息速览
六苯并蒄危害信息
【关于每周分子】
自2001年以来,“每周分子”已成为广受欢迎的栏目。多数分子由读者推荐。每个结构都经由科学家审查,并以3-D和平面图像的形式显示,同时附有该分子简介。可以通过美国化学文摘社 (CAS) 提供的CAS SciFindern中的CAS REGISTRY获取“每周分子”的更多信息。CAS REGISTRY中的每条物质信息都展示了物质的CAS登记号、索引名、通用名、商品名、书目信息等其他更多信息。发送邮件至motw@acs.org推荐您感兴趣的分子吧。
Hexa-peri-benzocoronene (HBC), or, more commonly, hexabenzocoronene, is a planar polycyclic aromatic hydrocarbon (PAH). Structurally, it consists of a central benzene ring surrounded first by six more benzene rings to form coronene, which in turn is surrounded by six additional benzenes for a total of 13 rings. HBC is in the D6h symmetry group.
Two HBC syntheses appeared in 1958. In one, A. Halleux, R. H. Martin, and G. S. D. King at European Research Associates (Brussels) used two reactions to make the molecule: the cyclodehydrogenation of hexaphenylbenzene and the reaction of dibenz-1,9;2,3-anthrone with Zn/ZnCl2. They also isolated two new hydrocarbons from the Zn/ZnCl2 reaction.
In the other synthesis, E. Clar and C. T. Ironside at the University of Glasgow first treated 2,3,7,8-dibenzoperinaphthene with bromine, then heated the brominated product to form tetrabenzoperopyrene (TBP) Additional heating dehydrogenated TBP to produce HBC. The authors also reported that HBC emits orange-yellow phosphorescence in solid solution at low temperatures.
In 2014, Andreas Hirsch and collaborators at the University of Erlangen–Nuremberg (Germany) synthesized a compound in which HBC is covalently linked to buckminsterfullerene. The authors stated that this “dyad” could serve as a versatile template for optoelectronic applications. X-ray crystallography showed that the bond distance between the two aromatic components is only 3.17 Å.
In another example of HBC and its derivatives combined with other chemical structures, Aleksey E. Kuznetsov at Federico Santa María Technical University (Santiago, Chile) paired HBCs with antiaromatic sulfur- and selenium-core-modified porphyrins (isophlorins). In this theoretical study, the author found that isophlorins had profound effects on the structural and electronic properties of the dyads and therefore likely their reactivities.
Although PAHs similar to HBC are known carcinogens, there are no reports in the literature of its carcinogenicity.
Hexa-peri-benzocoronenefast facts
Grayanotoxinshazard information
About Molecule of the Week
MOTW has been a popular feature on ACS website since 2001. Many molecules are suggested by our website visitors. Every structure is reviewed by a scientist and displayed in 3-D and flat images with a brief description. Each week’s molecule also links to a sample record from the CAS REGISTRY, which is searched using CAS SciFindern. Each record displays the registry number, index name and synonyms, bibliographic information, and more. Send us a molecule suggestion at motw@acs.org.
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