Browsing by Author "Tsai, Sung-Yu"

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Hydrogen Bonding-Induced H-Aggregation for Fluorescence Turn-On of the GFP Chromophore: Supramolecular Structural Rigidity
(1970-01-01)
Tsai, Meng-Shiue
;
Tsai, Sung-Yu
;
Huang, Yi-Fan
;
Wang, Chien-Lung
;
Sun, Shih-Sheng
To turn on the fluorescence of the native green fluorescence protein (GFP) chromophore, 4-hydroxybenzylidene-dimethylimidazolinone (HBDI), in an artificial supramolecular system has been a challenging task, because it requires high local environmental rigidity. This work shows that the formation of H-aggregates of an HBDI-containing organogelator results in two orders of magnitude fluorescence enhancement (phi(f)=2.9 vs. 0.02 %), in which the inter-HBDI OH...OH H-bonds play a crucial role. The aggregation-induced fluorescence enhancement of HBDI has important implications on the origin of the high fluorescence quantum efficiency of HBDI in the GFP beta-barrel and on the supramolecular strategy for a full fluorescence recovery of HBDI. These results reveal a new approach to designing rigid chromophore aggregates for high-performance optoelectronic properties.
Preparation of polyhedral oligomeric silsesquioxane-containing block copolymer with well-controlled stereoregularity
(1970-01-01)
Tsai, Sung-Yu
;
Kuretani, Satoshi
;
Manabe, Kei
;
Terao, Toshiki
;
Komamura, Takahiro
Preparation of functional domains with a spacing of 10 nm is a benchmark set to fabricate next-generation electronic devices. Organic-inorganic block copolymers form well-ordered microphase separations with very small domain sizes. The design and preparation of a novel block copolymer consisting of syndiotactic polymethyl methacrylate (st-PMMA) and polyhedral oligomeric silsesquioxane (POSS)-functionalized polymethacrylate, designated as st-PMMA-b-PMAPOSS, which can recognize functional molecules, are reported. The st-PMMA segments form a helical structure and encapsulate C-60 in the helical nanocavity, leading to the formation of an inclusion complex. Although the ordering of the domains is not high, C-60 domains that are in a quasi-equilibrium state, with about 10-nm domain spacings, are generated using st-PMMA-b-PMAPOSS that can recognize functional molecules. (c) 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019