Effect of the Chain Length on the Photonic Efficiency of Aromatic−Aliphatic Dendronized Polyethers
作者:G. Pistolis、A. K. Andreopoulou、Angelos Malliaris、J. K. Kallitsis
DOI:10.1021/ma035568h
日期:2004.2.1
Polychromophores comprised of rigid-flexible alternating polyethers have been synthesized. In these polymers, the rigid part of the main chain is a quinquephenyl fluorophore decorated with two second generation Frechet-type side dendrons, while the flexible part is an aliphatic chain of 11 or 12 methylene groups. The effect of the length of the flexible spacer on the photoluminescence of these dendronized polyethers was examined in solution and in the solid state. It was found that even a subtle change in this length, from 11 to 12 methylene groups, had a strong effect on the fluorescence quantum yield of thin films, a fact which is of the greatest importance for the potential applications of these polymers as OLEDs.
Synthesis and Characterization of Luminescent Rod–Coil Block Copolymers by Atom Transfer Radical Polymerization: Utilization of Novel End-Functionalized Terfluorenes as Macroinitiators
作者:Panagiotis K. Tsolakis、Joannis K. Kallitsis
DOI:10.1002/chem.200390115
日期:2003.2.17
Two novel, rigid, photoluminescent, substituted terfluorene derivatives were synthesized by utilizing direct bromination and Suzuki coupling reactions. These oligomers were used as initiators for the atom transfer radical polymerization (ATRP) of styrene and tert-butyl acrylate. Thus, diblock and triblock rod-coilblockcopolymers were prepared with well-defined structure, as far as their size and