Synthesis and properties of two novel regioregular conjugated polythiophenes with side-chain containing different substituted end groups

Abstract

as an oxidizing agent. In P3BLMT and P3BRMT, substituted piperidine rings are connected with the polythiophene backbone through carbon-carbon double bond. While in the two polythiophenes, the significant difference is the substituent linked to the N-atom of the piperidine effectively. Structures of the monomers and the corresponding soluble polymers were elucidated by 1 H NMR, 13 C NMR, and IR. Average molecular weights have been determined by gel permeation chromatography. Photoluminescence spectra and ultraviolet-visible spectra of the two polythiophenes in both solution and solid states were also investigated, and all peaks were bathochromically shifted when they were measured in the solid state. The results of optical and electrochemical measurements indicate that the carbonyl group on the sidechain has obvious influence on the electrochemical properties of the conjugated polythiophenes. In addition, the polymers were also characterized by cyclic voltammetry and scanning electron microscopy.

Restricted Aggregate Formation on Tetraphenylethene-Substituted Polythiophenes

“…28 Upon going to the solid state (thin films), it was found that the absorption and emission spectra of homoPT and coPT closely resemble the spectroscopic features observed in solution (although with a ∼20 nm red-shift in the emission spectra; see Table 2). As described elsewhere, 27,29,30 the steric hindrance of the TPE bulky groups and increased rigidity prevent the polymer chains from packing (by increasing the separation distance between polymer chains) and lead to similar spectroscopic properties in solution and in the solid state. On the contrary, for the investigated P3HT (M̅ w = 18500 g mol −1 ) and as previously reported for polythiophenes (including P3HT with different M̅ w values), significant differences were seen when going from solution to solid films.…”

Fullerene Functionalized Polystyrene: Synthesis, Characterizations, and Application in Bulk Heterojunction Polymer Solar Cells

“…The first one is a regiorandom P3HT (rra-P3HT), which contains a relatively low content of head-to-tail linkage. Another type is a regioregular P3HT (rr-P3HT), which contains more than 94% head-to-tail linkages [10][11][12][13]. The latter type is also referred as an electronic grade polymer and is widely used in solar cell applications due to its lower band gap energy.…”

Synthesis of a novel water-soluble conjugated polyelectrolyte based on polycyclopentadithiophene backbone and its application for heparin detection

“…[2,3] In recent years, CPEs have been reported on bio-applications such as DNA sensor, [4] DNA microarray, [5] protein sensor, [6] bio-imaging, [7] as well as optoelectronic applications such as organic lightemitting diodes, [8] organic semiconductors and actuators. [9,10] The widely used CPEs are mainly based on several conjugated polymer backbones, including polythiophene (PT), [11] fluorene-benzene copolymers(PFP), [12] polyphenylene (PPP), and polyphenylene vinylene (PPV). [13] In order to improve the water solubility and optoelectronic properties of CPE, some methods have been used in CPE designing, [14] such as identifying new polymer backbones or charged groups.…”