Title of article :
Neutral poly(3,4-ethylenedioxythiophene-2,5-diyl)s: preparation by organometallic polycondensation and their unique p-doping behavior
Author/Authors :
Yamamoto، نويسنده , , Takakazu and Shiraishi، نويسنده , , Kouichi and Abla، نويسنده , , Mahmut and Yamaguchi، نويسنده , , Isao and Groenendaal، نويسنده , , Joel L. Bert، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2002
Pages :
9
From page :
711
To page :
719
Abstract :
Neutral and non-doped poly(3,4-ethylenedioxythiophene), PEDOTh(Ni), and its hexyl derivative, PEDOTh-C6(Ni), have been prepared by organometallic dehalogenation polycondensation of 2,5-dichloro-3,4-ethylenedioxythiophene and its hexyl derivative with a zerovalent nickel complex. PEDOTh-C6(Ni) was soluble in organic solvents and 1H NMR data indicated that it had an Mn of 11,000. MALDI-TOF mass analysis of PEDOTh(Ni) gave Mn and Mw of about 1700 and 2400, respectively. PEDOTh-C6(Ni) showed a UV–Vis absorption peak at 546 nm in CHCl3. Electrochemical oxidation of PEDOTh-C6(Ni) started at about −0.40 V vs Ag+/Ag and gave a peak at 0.20 V vs Ag+/Ag. Chemical and electrochemical oxidation (or p-doping) of PEDOTh-C6(Ni), both in solutions and in a solid state, led to weakening of the original π–π∗ peaks and rise of new peak(s) in a region of 800–1500 nm. The p-doping of PEDOTh-C6(Ni) caused not only a decrease in the intensity of 1H NMR signals of the bridging ethylene hydrogens but also a decrease in that of the hexyl side chain, suggesting a strong interaction of the p-dopant with the side chain. NMR data of poly(3-methoxythiophene-2,5-diyl) also supported an assumption that p-doping brings about a severe change in electronic state of the substituent attached to the polythiophene main chain. PEDOTh(Ni) had a density of 1.71 g cm−3; the molecular packing mode of PEDOTh(Ni) is discussed based on the density of the polymer and its XRD data.
Keywords :
Poly(3 , 4-ethylenedioxythiophene) and hexyl derivative , Optical and electronic properties , p-Doping behavior
Journal title :
Polymer
Serial Year :
2002
Journal title :
Polymer
Record number :
1716410
Link To Document :
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