Synthesis of polymers with isolated thiophene-arylidene-thiophene chromophores for enhanced and specific electron/hole transport

Abstract

The synthesis of nine new polymers intended for future use in light‐emitting diodes is described. The polymers consist of alternating units of thiophene–arylidene–thiophene chromophores and saturated silicon‐containing spacers. The arylidene moieties include benzene‐1,4‐, 2,5‐dimethoxybenzene‐1,4‐, naphthalene‐1,4‐, anthracene‐9,10‐, pyridine‐2,5‐, pyridine‐2,6‐, N‐methylcarbazole‐3,6‐, 1,3,4‐oxadiazole‐2,5‐, and 4,4′‐dimethyl‐2,2′‐bithiazole‐5,5′‐. The syntheses involved dibromination of the central arene followed by Suzuki or Kumada cross‐coupling reactions with two thiophene units. Subsequent dilithiation and reaction with dihalosilylalkanes provided the polymers. Their optical properties, including ultraviolet–visible absorption and emission in solution, were comparable to those of the parent monomer units, and they possessed the physical characteristics of macromolecules. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 872–879, 2001

Surface selectivity competition of newly synthesized polyarylidene(keto amine) polymers toward different metal ions

“…From the data presented in Table , it was noticed that the weight‐average molecular weight ( M w ) were from 40,193.7 to 33,578.6 for polymers 3 b – d as selected examples. This average molecular weight is considered as high molecular weight in comparison to that previously reported in the literature for nearly similar thiophene–arylidene–thiophene system . In all cases, the linking aliphatic, cyclic, and aromatic units gave nearly the same molecular weight of the polymers.…”

Preparation of Optically Active Pyridine-Based Conducting Polymer Films Using a Liquid Crystal Electrolyte Containing a Cholesterol Derivative

“…All compounds were confirmed to be ∼100% pure by thin-layer chromatography. 14 Preparation of Cholesteric Liquid Crystal Electrolyte. It is generally known that CLC with a helical structure can be formed constituents of the CLC electrolytes are summarized in Table 1.…”

Efficient, Nickel‐Catalysed Kumada–Tamao–Corriu Cross‐ Coupling with a Calix[4]arene‐Diphosphine Ligand

“…The Kumada-Tamao-Corriu cross-coupling [1][2][3] is the reaction between a Grignard reagent and an aryl or vinyl halocarbon catalysed by nickel or palladium complexes. [4][5][6][7][8] In the last three decades this valuable synthetic tool has been applied to the preparation of a variety of organic molecules, including natural products, polymers, and liquid crystals. First reported in 1972, it constituted at that time the starting point for the discovery of many new cross-coupling reactions.…”