Contorted tetrabenzoacenes of varied conjugation: charge transport study with single-crystal field-effect transistors
作者:Ding-Chi Huang、Chi-Hsien Kuo、Man-Tzu Ho、Bo-Chao Lin、Wei-Tao Peng、Ito Chao、Chao-Ping Hsu、Yu-Tai Tao
DOI:10.1039/c7tc02254a
日期:——
polyfused aromatic tetrabenzoacene derivatives differing in conjugation length were synthesized and characterized. X-ray diffraction revealed the contorted molecular shape, as well as the packing arrangement of these molecules. Thus unsubstituted tetrabenzoacenes showed a shifted or perfect face-to-face π-stacking depending on their conjugation length. The single crystals of these tetrabenzoacenes were
合成并表征了一系列不同的共轭长度的扭曲和多稠合的芳族四苯并并苯衍生物。X射线衍射揭示了扭曲的分子形状以及这些分子的堆积排列。因此,取决于它们的共轭长度,未取代的四苯并并并苯显示出偏移的或完美的面对面π堆积。这些四苯并并苯并呋喃的单晶用作制造场效应晶体管(SCFET)的导电通道。四苯并四苯(TBT)表现出最高的迁移率,接近0.81 cm 2 V -1 s -1(平均0.64 cm 2 V -1 s -1)在这些分子中。相比之下,理论计算表明四苯并辛并茂(TBO)晶体具有大面积,面对面π堆积,并且在该系列中具有最高的分子间偶联。观察到的较低的电荷迁移率(平均0.32 cm 2 V -1 s -1,最高0.55 cm 2 V -1 s -1)被合理化,这是由于在TBO中存在可比的电子耦合和重组能而导致了离域极化子形成的可能。,得到了蒙特卡洛模拟的支持,并考虑了这种离域效应。
Synthesis of ketone and alcohol derivatives of methylene-bridged polyarenes, potentially new classes of active metabolites of carcinogenic hydrocarbons
作者:Ronald G. Harvey、Elias Abu-Shqara、Cheng Xi Yang
DOI:10.1021/jo00049a045
日期:1992.11
Methods for the syntheses of bridge ketone and alcohol derivatives of methylene-bridged polyarenes from the parent hydrocarbons are described. The polyarenes investigated include 4H-cyclopenta[def]phenanthrene (1a), fluorene (2a), 7H-benzo[c]fluorene (3a), 4H-cyclopenta[def]chrysene (4a), 11H-Benz[bc]aceanthrylene (5a), 10H-indeno[1,2,7,7a-bcd]pyrene (6a), 11H-dibenzo[bc,l]aceanthrylene (7a), 4H-fluoreno[4,4a,4b,5-abc]anthracene (8a), and 7H-dibenzo[a,g]fluorene (9a). The bridge ketone derivatives are most efficiently synthesized via treatment of the parent hydrocarbons with n-butyllithium and reaction of the resulting anionic intermediates with molecular oxygen. The direct formation of ketones rather than the expected hydroperoxides from reaction of the bridge anions With O2 presumably involves intra- or intermolecular abstraction of a proton from the benzylic site of the intermediate by the peroxy anion leading to loss of hydroxide ion with formation of a carbonyl group. Yields are generally high except in the cases of 1a and 4a; the former affords as the principal product a dimeric alcohol arising from reaction of the anion of 1a with the corresponding ketone lb. The related bridge alcohols am readily obtained in yields of 75-95% by reduction of the crude products from the preceding oxidations with NaBH4.
Sythesis of methylene-bridged polyarenes
作者:ChengXi Yang、Ronald G. Harvey
DOI:10.1016/s0040-4020(01)92265-3
日期:1992.1
synthetic approaches are lacking. Convenient syntheses of a series of methylene-bridge polyarenes are now described. These syntheses are based upon the prototype hydrocarbon cyclopenta[def]phenanthrene (1) which contains a pre-existing methylene bridge. Polyarenes prepared include 13H-dibenz[bc,l]aceanthrylene (3), 4H-cyclopenta[pqr]picene (5) 4H-benzo[b]cyclopenta[mno]chrysene (6), 13H-indeno[2,1,7-qra]naphthacene
First Examples of Stable Arenium Ions from Large Methylene-Bridged Polycyclic Aromatic Hydrocarbons (PAHs). Directive Effects and Charge Delocalization Mode
作者:Kenneth K. Laali、Takao Okazaki、Ronald G. Harvey
DOI:10.1021/jo0100603
日期:2001.6.1
persistent arenium ions from large methylene-bridged PAHs (mostly 22pi six-fused ring systems). Low-temperature protonation (FSO(3)H/SO(2)ClF) and model nitration (with HNO(3)/HOAc or NO(2)(+) BF(4)(-)) were used as mimic reactions for generation of biological electrophiles. The site(s) of protonation (and nitration) were determined as a function of PAH structure. Chargedelocalization mode in the resulting