Issue 9, 2012

Aggregation induced emission enhancement in relation to the secondary structures of poly(γ-benzyl-l-glutamate) containing a fluorescent tetraphenylthiophene moiety

Abstract

In this study, tetraphenylthiophene (TP) with aggregation-induced emission enhancement (AIEE) property served as the terminal and central fluorophores of poly(γ-benzyl-L-glutamate) (PBLG)-based polymers of TP1PBLG and TP2PBLG, respectively, to probe the relationship between the secondary structure (α-helix) of polypeptides and the AIEE-operative fluorescence (FL). Intermolecular aggregation of the central TP unit in the di-substituted TP2PBLG is sterically blocked by the large α-helical PBLG chains, which leads to the reduced AIEE-oriented FL. In contrast, the terminal TP units in TP1PBLG can easily approach each other to form aggregates with strong FL. Factors (e.g. solvent annealing) controlling the fraction of the α-helix chain also vary the corresponding emission intensity. The conformational difference between TP1PBLG and TP2PBLG evaluated from the infrared and the X-ray (wide- and small-angle) diffraction spectra is also used to verify its influence on the AIEE-operative FL behavior.

Graphical abstract: Aggregation induced emission enhancement in relation to the secondary structures of poly(γ-benzyl-l-glutamate) containing a fluorescent tetraphenylthiophene moiety

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2012
Accepted
08 May 2012
First published
18 Jun 2012

Polym. Chem., 2012,3, 2393-2402

Aggregation induced emission enhancement in relation to the secondary structures of poly(γ-benzyl-L-glutamate) containing a fluorescent tetraphenylthiophene moiety

S. Li, Y. Lin, S. Kuo, W. Chuang and J. Hong, Polym. Chem., 2012, 3, 2393 DOI: 10.1039/C2PY20221B

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