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Volumn 51, Issue 11, 2010, Pages 2255-2263

Tyrosine-based poly(m-phenyleneethynylene-p-phenyleneethynylene)s. Helix folding and responsiveness to a base

Author keywords

Amino acid; Helix; Poly(phenyleneethynylene)

Indexed keywords

AMINO ACIDS; ESTERS; SODIUM HYDROXIDE;

EID: 77954864889     PISSN: 00323861     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.polymer.2010.03.048     Document Type: Article
Times cited : (19)

References (45)
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    • Since it is difficult to determine the racemization of the chiral carbon atoms in the polymer, we have checked the racemization of N-α-tert-butoxycarbonyl-l-tyrosine methyl ester (1') as a model compound of the polymer instead. When 1' was kept in Et3N/DMF = 2/3 (v/v, 0.2thomampersand
    • Since it is difficult to determine the racemization of the chiral carbon atoms in the polymer, we have checked the racemization of N-α-tert-butoxycarbonyl-l-tyrosine methyl ester (1') as a model compound of the polymer instead. When 1' was kept in Et3N/DMF = 2/3 (v/v, 0.2 M) at 80 °C for 24 h (the same conditions as those of the polymerization), the [α]d (CHCl3, c = 0.10 g/dL) changed from +56° to +52°. This result indicates that 7% racemization took place.
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    • We measured the CD and UV-vis spectra of poly(1) in NaOH solutions with low concentrations (less than 0.18%) at room temperature, immediately after preparing the samples. The measurement time for CD and UV-vis spectra was ca. 1 min for each sample. It is considered that hydrolysis during the measurement is negligible.
    • We measured the CD and UV-vis spectra of poly(1) in NaOH solutions with low concentrations (less than 0.18%) at room temperature, immediately after preparing the samples. The measurement time for CD and UV-vis spectra was ca. 1 min for each sample. It is considered that hydrolysis during the measurement is negligible.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.