Rapid Syntheses of Oligo(2,5-thiopheneethynylene)s with Thioester Termini: Potential Molecular Scale Wires with Alligator Clips was written by Pearson, Darren L.;Tour, James M.. And the article was included in Journal of Organic Chemistry in 1997.Computed Properties of C6H8S This article mentions the following:
The syntheses of soluble oligo(3-ethyl-2,5-thiopheneethynylene)s via an iterative divergent/convergent approach starting from 3-ethyl-2-[(trimethylsilyl)ethynyl]thiophene are described. The monomer, dimer, tetramer, octamer, and 16-mer were synthesized. The 16-mer is 100 Å 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 show that at the octamer stage, the optical absorbance maximum is nearly saturated The size exclusion chromatog. values for the number average weights, relative to polystyrene, illustrate the tremendous differences in the hydrodynamic volume of these rigid rod oligomers vs. 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 was 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 mol. chains so that future conduction studies could be done between proximal metallic probes. The rigid rod conjugated oligomers may act as mol. wires in mol. scale electronic devices, and they also serve as useful models for understanding analogous bulk polymers. In the experiment, the researchers used many compounds, for example, 3-Ethylthiophene (cas: 1795-01-3Computed Properties of C6H8S).
3-Ethylthiophene (cas: 1795-01-3) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.Computed Properties of C6H8S
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem