TY - JOUR
T1 - Highly controlled side-chain chromophore orientation in poly [N5-1-(1-pyrenyl)ethyl-L-glutamines]
AU - Shoji, Osami
AU - Nakajima, Daisuke
AU - Annaka, Masahiko
AU - Yoshikuni, Masako
AU - Nakahira, Takayuki
N1 - Funding Information:
The authors thank Professor Masami Sakamoto for his help in carrying out X-ray structural analysis. This work was supported by a Grant-in-Aid for Scientific Research (Grant No. 10650863) from the Ministry of Education, Science, Sports and Culture of Japan.
PY - 2002/1/7
Y1 - 2002/1/7
N2 - Poly[N5-(R and S)-1-(1-pyrenyl)ethyl-L-glutamines] (1 and 2) were prepared by condensation of poly(L-glutamic acid) with optically resolved amines. In solution, these polymers, 2 in particular, gave large circular dichroism (CD) indicative of exciton coupling among the side-chain pyrene chromophores. When compared with the corresponding polymer with achiral side groups, i.e. poly(1-pyrenylmethyl-Lglutamine) (3), 1 and 2 not only gave much stronger CD, but also gave much reduced excimer emission with a significant hypsochromic shift of emission maximum. The highly controlled orientation of the side-chain chromophores is apparently brought about by the specific steric interactions among the bulky chiral side chains along the helical main chain.
AB - Poly[N5-(R and S)-1-(1-pyrenyl)ethyl-L-glutamines] (1 and 2) were prepared by condensation of poly(L-glutamic acid) with optically resolved amines. In solution, these polymers, 2 in particular, gave large circular dichroism (CD) indicative of exciton coupling among the side-chain pyrene chromophores. When compared with the corresponding polymer with achiral side groups, i.e. poly(1-pyrenylmethyl-Lglutamine) (3), 1 and 2 not only gave much stronger CD, but also gave much reduced excimer emission with a significant hypsochromic shift of emission maximum. The highly controlled orientation of the side-chain chromophores is apparently brought about by the specific steric interactions among the bulky chiral side chains along the helical main chain.
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U2 - 10.1016/S0032-3861(01)00740-6
DO - 10.1016/S0032-3861(01)00740-6
M3 - Article
AN - SCOPUS:0037033756
VL - 43
SP - 1711
EP - 1714
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 5
ER -