Extended orthogonally fused conducting oligomers for molecular electronic devices
作者:James M. Tour、Ruilian Wu、Jeffry S. Schumm
DOI:10.1021/ja00018a069
日期:1991.8
Abstract : Described is an approach to orthogonallyfused conjugated organic compounds that may act as molecular switching devices. Four thiophene trimers are added in a single operation to spiro-fused cores to afford the target molecules. A spiro-fused thiophene-based monomer system is converted to a spiro- fused heptamer that is 25 A long. The synthesis of a mixed phenylene-thiophene system is described
摘要:描述了一种可用作分子开关器件的正交稠合共轭有机化合物的方法。在一次操作中将四个噻吩三聚体添加到螺旋融合核心以提供目标分子。一个基于螺环稠合噻吩的单体系统被转化为一个长度为 25 A 的螺环稠合七聚体。描述了混合亚苯基-噻吩系统的合成,该系统提供了 30 长的螺合八聚体。在每种情况下,噻吩上的烷基取代基都提供可溶性物质。三甲基甲硅烷基端基位于每个正交稠合系统的侧翼。有机钯和有机镍催化的过程广泛用于合成正交稠合化合物。
Synthesis of Monodisperse Oligo[(1,4‐Phenyleneethynylene)‐Alt‐(2,5‐Thiopheneethynylene)]s
作者:Guorong Li、Xianhong Wang、Ji Li、Xiaojiang Zhao、Fosong Wang
DOI:10.1081/scc-200046517
日期:2005.1.1
Abstract The synthesis of monodisperseoligo[(1,4‐phenyleneethynylene)‐alt‐(2,5‐thioph‐eneethynylene)]s using an iterative divergent/convergent doubling strategy based on Sonogashira coupling reaction was presented.
Rapid Syntheses of Oligo(2,5-thiophene ethynylene)s with Thioester Termini: Potential Molecular Scale Wires with Alligator Clips
作者:Darren L. Pearson、James M. Tour
DOI:10.1021/jo962335y
日期:1997.3.1
The syntheses of soluble oligo(3-ethyl-2,5-thiophene ethynylene)s via an iterative divergent/convergent approach starting from 3-ethyl-2-(trimethylsilylethynyl)thiophene are described. The monomer, dimer, tetramer, octamer, and 16-mer were synthesized. The 16-mer is 100 Angstrom long in its minimized extended zigzag conformation. At each stage in the iteration, the length of the framework doubles. Only three sets of reaction conditions are needed for the entire iterative synthetic sequence: an iodination, a protodesilylation, and a Pd/Cu-catalyzed cross coupling. The oligomers were characterized spectroscopically and by mass spectrometry. The optical properties are presented which show that at the octamer stage, the optical absorbance maximum is nearly saturated. The size exclusion chromatography values for the number average weights, relative to polystyrene, illustrate the tremendous differences in the hydrodynamic volume of these rigid rod oligomers verses the random coils of polystyrene. These differences become quite apparent at the octamer stage. Attachment of thiol end groups, protected as the thioacetyl moieties, was achieved. These serve as binding sites for adhesion to gold surfaces. In some cases, one end of the oligomeric chains were capped with a thiol group so that the surface attachments to gold could be studied. In other cases, thiol groups were affixed to both ends of the molecular chains so that future conduction studies could be done between proximal metallic probes. The rigid rod conjugated oligomers may act as molecular wires in molecular scale electronic devices, and they also serve as useful models for understanding analogous bulk polymers.