Phenacenes are a class of organic compounds consisting of fused aromatic rings. They are polycyclic aromatic hydrocarbons, related to acenes and helicenes from which they differ by the arrangement of the fused rings.
| [n]Phenacene | Common name | Structure |
|---|---|---|
| [4]phenacene | Chrysene | 
|
| [5]phenacene | Picene | 
|
| [6]phenacene | Fulminene | 
|
| [7]phenacene | 
|
Relevance to organic electronic materials
[edit]Aromatic compounds with extended π-conjugated system have attracted attention because of their potential use in organic electronics as organic semiconductors.[1] Of academic interest, pentacene has been widely used as an active layer in organic thin-film field-effect transistors (OFET). The main drawback of pentacene OFET is degradation upon exposure to light and air. On the other hand, [n]phenacenes, an isomeric form of [n]acenes, has been known as a stable compound in which the benzene rings are fused in a zigzag structure. For the past several years, there is renewed interest in synthesis of [n]phenacene derivatives associated with electronic applications in emissive and semi- or superconducting materials.[2][3][4]
Picene ([5]phenacene) can serve as an active layer of a high-performance p-channel organic thin-film FET with very high field-effect mobility μ = 5 cm2/(V⋅s).[5] [7]Phenacene FET shows μ = 0.75 cm2/(V⋅s) and no sensitivity to air. Furthermore, picene doped with potassium and rubidium exhibit superconductivity with a maximum critical temperature TC ≈ 18 K.[4] Thus, [n]phenacenes and their derivatives may play an important role in future fabrication of stable and high-performance electronic devices such as OFET, OLED and organic solar cells. Substituted picenes may serve as an active layer of OFETs.[6]
References
[edit]- ^ Yamashita, Yoshiro (2009). "Organic semiconductors for organic field-effect transistors". Science and Technology of Advanced Materials. 10 (2): 024313. Bibcode:2009STAdM..10b4313Y. doi:10.1088/1468-6996/10/2/024313. ISSN 1468-6996. PMC 5090443. PMID 27877286.
- ^ Komura, N.; Goto, H.; He, X.; Mitamura, H.; Eguchi, R.; Kaji, Y.; Okamoto, H.; Sugawara, Y.; Gohda, S.; Sato, K.; Kubozono, Y. (2012). "Characteristics of [6]phenacene thin film field-effect transistor". Appl. Phys. Lett. 101 (8): 083301. Bibcode:2012ApPhL.101h3301K. doi:10.1063/1.4747201.
- ^ Ionkin, A. S.; Marshall, W. J.; Fish, B. M.; Bryman, L. M.; Wang, Y. (2008). "A tetra-substituted chrysene: orientation of multiple electrophilic substitution and use of a tetra-substituted chrysene as a blue emitter for OLEDs". Chem. Commun. (20): 2319. doi:10.1039/b715386d.
- ^ a b Mitsuhashi, R.; Suzuki, Y.; Yamanari, Y.; Mitamura, H.; Kambe, T.; Ikeda, N.; Okamoto, H.; Fujiwara, A.; Yamaji, M.; Kawasaki, N.; Maniwa, Y.; Kubozono, Y. (2010). "Superconductivity in alkali-metal-doped picene". Nature. 464 (7285): 76–79. Bibcode:2010Natur.464...76M. doi:10.1038/nature08859. PMID 20203605.
- ^ Okamoto, H.; Kawasaki, N.; Kaji, Y.; Kubozono, Y.; Fujiwara, A.; Yamaji, M. (2008). "Air-assisted high-performance field-effect transistor with thin films of picene". J. Am. Chem. Soc. 130 (32): 10470–10471. doi:10.1021/ja803291a. PMID 18627146.
- ^ Nakano, Y.; Saito, M.; Nakamura, H. WO 2010016511 A1 20100211[clarify], 2010.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction