کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5190094 1381198 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tune of the helix sense of amino acid-containing poly(N-propargylamides) by temperature and solvent. Control by competition between structurally different units with the same chirality
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Tune of the helix sense of amino acid-containing poly(N-propargylamides) by temperature and solvent. Control by competition between structurally different units with the same chirality
چکیده انگلیسی
Homo- and copolymerizations of chiral amino acid-based N-propargylamides, i.e., N-(tert-butoxycarbonyl)-l-alanine N′-propargylamide (LA) and N-(trifluoroacetyl)-l-valine N′-propargylamide (FLV), were conducted with (nbd)Rh+[η6-C6H5B−(C6H5)3] as a catalyst to afford the corresponding copolymers with moderate molecular weights in good yields. The CD and UV-Vis spectra showed that poly(LA) and poly(FLV) take helical structures with predominantly one-handed helices, whose CD signs are opposite. The helices of the homopolymers could be tuned by temperature and solvent. The specific rotation, CD and UV-Vis spectra showed that some of the copolymers underwent temperature- and solvent-induced helix inversion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 9, 15 April 2005, Pages 2841-2846
نویسندگان
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