制备了在6,13位被芳基取代的并五苯衍生物,并研究了它们的电子性质以及与氧的光加成反应。被2-噻吩基和苯基取代的并五苯衍生物在光照下与溶液中的氧反应,得到其内过氧化物。这些一阶动力学常数经评估为1.5×10 -3 s -1和2.7×10 -3 s -1。具有五氟苯基的并五苯衍生物在溶液中相对稳定。具有2-噻吩基的内过氧化物的热解和光解在溶液中得到并五苯衍生物,其产率分别为30%和44%。另外,研究了内过氧化物薄膜的紫外线照射(254 nm),这表明并五苯衍生物的复制。
Reduction versus Rearrangement of 6,13-Dihydro-6,13-diarylpentacene-6,13-diols Affording 6,13- and 13,13′-Substituted Pentacene Derivatives
作者:Wim Dehaen、Nathalie Vets、Mario Smet
DOI:10.1055/s-2004-836055
日期:——
Pentacene has excellent semi-conducting properties but its practical use in organic thin film transistors (OTFTs) gives rise to a lot of problems caused by its sensitivity to oxygen and its very low solubility. In order to solve the problems involved in the use of pentacene, different aryl substituents were introduced on the 6- and 13-positions. Formation of the pentacene ring system may be accompanied by the rearrangement of the starting dihydropentacenediol to a 13,13′-disubstituted pentacen-6-one for electron-rich aryl substituents. 6-Monosubstituted pentacenes were also prepared.
6,13-bis(thienyl)pentacene compounds are described that can be used as a semiconductor material. Semiconductor devices that contain the 6,13-bis(thienyl)pentacene compounds and methods of making such semiconductor devices are also described.
Application of Zirconacyclopentadienes (Metalla-heterocycles) and Cross-Coupling for the Convenient Preparative Method of 6,13-Disubstituted Pentacene
作者:Tamotsu Takahashi、Zhiying Jia、Shi Li、Kiyohiko Nakajima、Ken-ichiro Kanno、Zhiyi Song
DOI:10.3987/com-12-s(n)130
日期:——
Iodination of zirconacyclopentadiene derivative gave diiododiene derivative. The product was lithiated with t-BuLi and treated with diiodonaphthalene successively to afford 6,13-bis(trimethylsilyl)-5,14-dihydropentacene. A 6,13-diiodo-5,14-dihydropentacene was synthesized by iodination of 6,13-bis(trimethylsilyl)-5,14-dihydropentacene with ICl. This diiododihydropentacene was used for the introduction of substituent at 6 and 13 positions by the cross-coupling reactions with Pd catalyst. After aromatization by a combination of DDQ and gamma-terpinene or triethylamine, 6,13-disubstituted pentacene derivatives were synthesized.
New Oligothiophene-Pentacene Hybrids as Highly Stable and Soluble Organic Semiconductors
作者:Jing Wang、Ke Liu、Yi-Yang Liu、Cheng-Li Song、Zi-Fa Shi、Jun-Biao Peng、Hao-Li Zhang、Xiao-Ping Cao
DOI:10.1021/ol900838a
日期:2009.6.18
Two series of new oligothiophene-pentacene hybrid compounds were successfully synthesized and characterized, which consist of pentacene and anthradithiophene skeletons modified by different oligothienyl groups at 6,13 sites or 5,11 sites, respectively. Their optical, thermal, and electrochemical properties show regular variations with the length change of the side groups. These materials exhibit much higher solubility and significantly improved thermal and photooxidation stabilities compared with unmodified pentacene and anthradithiophene.
Organization of Acenes with a Cruciform Assembly Motif
作者:Qian Miao、Xiaoliu Chi、Shengxiong Xiao、Roswitha Zeis、Michael Lefenfeld、Theo Siegrist、Michael L. Steigerwald、Colin Nuckolls
DOI:10.1021/ja0570786
日期:2006.2.1
This study explores the assembly in the crystalline state of a class of pentacenes that are substituted along their long edges with aromatic rings forming rigid, cruciform molecules. The crystals were grown from the gas phase, and their structures were compared with DFT-optimized geometries. Both crystallographic and computed structures show that a planar acene core is the exception rather than the rule. In the assembly of these molecules, the phenyl groups block the herringbone motif and further guide the arrangement of the acene core into higher order structures. The packing for the phenyl-substituted derivatives is dictated by close contacts between the C-H's of the pendant aromatic rings and the carbons at the fusions in the acene backbone. Using thiciphene substituents instead of phenyls creates cofacially stacked acenes. In thin films, the thiophene-substituted derivative forms devices with good electrical properties: relatively high mobility, high ON/OFF ratios, and low threshold voltage for device activation. An unusual result is obtained for the decaphenyl pentacene when devices are fabricated on its crystalline surface. Although its acene cores are well isolated from each other, this material still exhibits good electrical properties.