𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Chain Length Dependence in Diketopyrrolopyrrole/Thiophene Oligomers

✍ Scribed by Bram P. Karsten; René A. J. Janssen

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
209 KB
Volume
212
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Diketopyrrolopyrrole‐based polymers have shown good performance in polymer solar cells. Monodisperse short oligomers, monomer up to tetramer, of one of these polymers, pBBTDPP1, have been prepared and the chain length dependence of their optical and electrochemical properties has been investigated. The optical and electrochemical data obtained in solution lead to the conclusion that conjugation in this system is very limited. The most probable reason for this is a twist in the backbone, caused by steric hindrance of the dodecyl side chains with the sulfur atoms. In thin films, the chain length dependence of the optical properties is much stronger, due to planarization of the oligomer chains upon aggregation. magnified image

📜 SIMILAR VOLUMES

Chain-Length-Dependent Termination in Ra
Chain-Length-Dependent Termination in Radical Polymerization of Acrylates
✍ Johannes Barth; Michael Buback; Gregory T. Russell; Sebastian Smolne 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 332 KB

## Abstract The technique of SPPLP EPR, which is single‐pulse pulsed‐laser polymerization (SPPLP) in conjunction with electron paramagnetic resonance (EPR) spectroscopy, is used to carry out a detailed investigation of secondary (chain‐end) radical termination of acrylates. Measurements are perform

Concentration and chain-length dependenc
Concentration and chain-length dependence of thermodynamic interactions in polyethylene isotope blends
✍ Buckley Crist 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 195 KB 👁 1 views

Small-angle neutron scattering (SANS) measurements of interactions in polymer blends, x NS , generally depend on blend concentration f, even though x NS is evaluated with a model that assumes that the thermodynamic interaction parameter x FH Å x NS is independent of f. Londono et al. have reported x

Synthesis and Chain-Length Dependence of
Synthesis and Chain-Length Dependence of the Electronic Properties of π-Conjugated Dithieno[3,2-b:2′,3′-d]pyrrole (DTP) Oligomers
✍ Ali Yassin; Philippe Leriche; Jean Roncali 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 253 KB

## Abstract __N__‐(2‐ethylhexyl)dithieno[3,2‐__b__:2′,3′‐__d__]pyrrole has been prepared and its dimer and trimer have been synthesized by Stille coupling. The electrochemical and optical properties of these compounds have been investigated by cyclic voltammetry, UV–Vis, and fluorescence emission s

Chain-Length Dependence of Singlet and T
Chain-Length Dependence of Singlet and Triplet Exciton Formation Rates in Organic Light-Emitting Diodes
✍ D. Beljonne; A. Ye; Z. Shuai; J.-L. Brédas 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 291 KB 👁 2 views

## Abstract The operation and efficiencies of molecular or polymer organic light‐emitting diodes depend on the nature of the excited species that are formed. The lowest singlet and triplet excitons display different characteristics that impact on the quantum yields achievable in the devices. Here,