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Volumn 41, Issue 11, 2003, Pages 1725-1736

Conformational analysis of dipeptide-derived polyisocyanides

Author keywords

Biomimetic; Chiral; Conformational analysis; Modeling; Polyisocyanides

Indexed keywords

BIOMIMETIC MATERIALS; CONFORMATIONS; CYANIDES; HYDROGEN BONDS; LIQUID CRYSTALS; MACROMOLECULES;

EID: 0038823613     PISSN: 0887624X     EISSN: None     Source Type: Journal    
DOI: 10.1002/pola.10713     Document Type: Article
Times cited : (49)

References (41)
  • 13
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    • Ph.D. Thesis, University of Utrecht
    • Huige, C. J. M. Ph.D. Thesis, University of Utrecht, 1985.
    • (1985)
    • Huige, C.J.M.1
  • 18
    • 0038469387 scopus 로고    scopus 로고
    • note
    • Quantitative theoretical and experimental analyses of the helix inversion barrier in polyisocyanates have been reported; see refs. 19 and 20.
  • 27
    • 0038469383 scopus 로고    scopus 로고
    • note
    • 10 helical conformation.
  • 30
    • 0038469384 scopus 로고    scopus 로고
    • note
    • In addition to the protonation of the amide groups and the subsequent disruption of the hydrogen-bonding pattern, the imine groups also can be protonated, and this, in turn, can cause syn - anti changes around the C=N bond. However, the changes in the chiroptical properties of L,L-PIAA and L-PIGA induced by acid were irreversible upon neutralization of the solution with a base, and similar, albeit less pronounced, changes in the CD spectra were also found for L,L-PIAA and L,D-PIAA with increasing temperature (see the text). This suggests that these are not likely the result of the protonation of the imines (see refs. 31 and 32). It has been found recently that the acid-induced changes in the chiroptical properties of L,D-PIAA can be reversed completely by titration with a base (see ref. 33).
  • 33
    • 0038807259 scopus 로고    scopus 로고
    • University of Nijmegen, Unpublished results
    • Metselaar, G. A. University of Nijmegen, Unpublished results, 2003.
    • (2003)
    • Metselaar, G.A.1
  • 37
    • 0038807263 scopus 로고
    • Ph.D. Thesis, University of Utrecht, The Netherlands
    • van der Eijk, J. M. Ph.D. Thesis, University of Utrecht, The Netherlands, 1980.
    • (1980)
    • Van der Eijk, J.M.1
  • 39
    • 0037412259 scopus 로고    scopus 로고
    • For L,D-PIAA, a high intrinsic viscosity was also measured ([η] = 5.26), whereas for poly(L-isocyanoalanyl ethyl ester), a much lower value ([η] = 0.44) was obtained. In the former case, a polymerization time of less than 5 min was found, in contrast to 7200 min in the latter case. See Cornelissen, J. J. L. M. Pure Appl Chem 2002, 74, 2021.
    • (2002) Pure Appl Chem , vol.74 , pp. 2021
    • Cornelissen, J.J.L.M.1
  • 40
    • 0038130402 scopus 로고    scopus 로고
    • note
    • 36 although no relationship with hydrogen-made formation was found at that time.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.