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Volumn 32, Issue 23, 1999, Pages 7942-7945

Metal-Induced Chirality Induction and Chiral Recognition of Optically Active, Regioregular Polythiophenes

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EID: 0001115673     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9912305     Document Type: Article
Times cited : (72)

References (49)
  • 1
    • 0031117834 scopus 로고    scopus 로고
    • For other references
    • Review: (a) Pu, L. Acte Polym. 1997, 45, 116-141. For other references, see:
    • (1997) Acte Polym. , vol.45 , pp. 116-141
    • Pu, L.1
  • 17
    • 84923157083 scopus 로고
    • For leading references for regioregular PT synthesis, see: (a) Chen, T.-A.; Rieke, R. D. J. Am. Chem. Soc. 1992, 114, 10087-10088.
    • (1992) J. Am. Chem. Soc. , vol.114 , pp. 10087-10088
    • Chen, T.-A.1    Rieke, R.D.2
  • 36
    • 85037475570 scopus 로고    scopus 로고
    • note
    • 3 for poly-la, poly-lb, and poly-lc, respectively, as determined by gel permeation chromatography (GPC) using chloroform as the eluent. Relatively low molecular weights of these polymers may be due to precipitation in solvents during polymerization. The >H NMR spectrum of poly-la in CDCb showed a sharp singlet centered at 6.84 ppm due to the thiophene ring proton at the 4-position, indicating that the polymer possesses a highly HT regioregular structure. On the contrary, the 'H NMR spectrum of poly-lb prepared with the CuO-modified Stille method showed rather broad resonances due to contamination with a small amount of paramagnetic Cu(II) ion used as a cocatalyst during the polymerization. After removal of the Cu(II) ion by extraction with aqueous ethylenediaminetetraacetic acid (EDTA), the resonances became sharper. Standard titration experiments12 using sodium diethyldithiocarbamate suggest that the poly-lb contains 0.2 equiv of Cu(II) ion to a monomer unit of poly-lb.
  • 38
    • 85037456134 scopus 로고    scopus 로고
    • note
    • 2 caused a significant red shift of the π-π transition of over 300 nm, and therefore, this possibility may also be excluded. (Figure Presented)


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.