標題: Effect of alkyl position of pyrrole on structures and properties of conjugated polysquaraines
作者: Lu, Hsiao-Chi
Whang, Wha-Tzong
Cheng, Bing-Ming
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Polysquaraine;Zwitterionic moiety;Solvatochromism;Absorption spectrum;Thermal IR spectrum
公開日期: 1-May-2010
摘要: Poly(1-octylpyrrolyl)squaraine and poly(3-octylpyrrolyl)squaraine were synthesized from squaric acid with 1-octylpyrrole and 3-octylpyrrole under identical conditions of condensation. Visible absorption spectra, photoluminescence spectra, TGA curves, and IR spectra were recorded to characterize the structures of these polymers as synthesized: the measured optical and thermal properties are consistent with backbone structures. The polysquaraine from 3-octylpyrrole possesses mostly zwitterionic repeating units (>97%), but the polymer from 1-octylpyrrole consists of zwitterionic and covalent repeating units in a ratio 2:1. Observations from the visible absorption and photoluminescence spectra in varied solvents, TGA curves, and thermal IR measurements for these two polymers reconciled to their structures. This result indicates that the position of the alkyl group in the pyrrole derivative affects the conformation in the condensation of poly(pyrrolyl)squaraine. These polysquaraines are stable below temperature 155 C and their visible absorption and photoluminescence properties in hydrogen-bonding solvents exhibit negative solvatochromism. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.synthmet.2010.02.016
http://hdl.handle.net/11536/5473
ISSN: 0379-6779
DOI: 10.1016/j.synthmet.2010.02.016
期刊: SYNTHETIC METALS
Volume: 160
Issue: 9-10
起始頁: 1002
結束頁: 1007
Appears in Collections:Articles


Files in This Item:

  1. 000277899600027.pdf