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Polymers 2017, 9(9), 419; https://doi.org/10.3390/polym9090419

Light-Up of Rhodamine Hydrazide to Generate Emissive Initiator for Polymerization and to Afford Photochromic Polypeptide Metal Complex

Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
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Received: 26 July 2017 / Revised: 24 August 2017 / Accepted: 25 August 2017 / Published: 5 September 2017
(This article belongs to the Special Issue Photo-Responsive Polymers)
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Abstract

Ring-opening polymerization (ROP) of cyclic peptide monomer of γ-propargyl-l-glutamate N-carboxyanhydride (PLG–NCA) was originally initiated by non-emissive, ring-close rhodamine 6G hydrazide (R-C). However, instantaneously after adding PLG–NCA to R-C, the spirolactam ring of R-C was opened by PLG–NCA, rendering emissive, ring-open R-O to initiate ROP of PLG–NCA. The emissive R-O moiety therefore produced fluorescent R–PLG with aggregation-induced emission (AIE) properties. Moreover, R–PLG was found to exhibit photochromic properties with good fatigue resistance and long lifetime when forming metal complexes with Sn(II) and Fe(III). In the dark, irradiated metal complexes slowly (~50 min) restored to the initial state. This research provides foundation for the development of new photochromic materials with long lifetime. View Full-Text
Keywords: aggregation-induced emission; polypeptide; metal ligand charge transfer; rhodamine; secondary structure; photochromic aggregation-induced emission; polypeptide; metal ligand charge transfer; rhodamine; secondary structure; photochromic
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gao, J.-Y.; Huang, W.-C.; Huang, P.-Y.; Song, C.-Y.; Hong, J.-L. Light-Up of Rhodamine Hydrazide to Generate Emissive Initiator for Polymerization and to Afford Photochromic Polypeptide Metal Complex. Polymers 2017, 9, 419.

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