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Title
Japanese: 
English:Mesoscopic Structural Aspects of Ca2+-Triggered Polymer Chain Folding of a Tetraphenylethene-Appended Poly(Acrylic Acid) in Relation to Its Aggregation-Induced Emission Behavior 
Author
Japanese: Ken Morishima, 石割文崇, 松村聡子, 福島孝典, Mitsuhiro Shibayama.  
English: Ken Morishima, Fumitaka Ishiwari, Satoko Matsumura, Takanori Fukushima, Mitsuhiro Shibayama.  
Language English 
Journal/Book name
Japanese: 
English:Macromolecules 
Volume, Number, Page Vol. 50    No. 15    pp. 5940–5945
Published date July 2017 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/acs.macromol.7b00883
Abstract We recently reported that tetraphenylethene-appended poly(acrylic acid) derivatives [PAA-TPEx (x = 0.01–0.05)] provide a fluorescent Ca2+ sensor, where aggregation-induced emission (AIE) of the TPE pendants occurs in conjunction with Ca2+-triggered polymer-chain folding. On the basis of dynamic and static light-scattering data, here we discuss the hydrodynamic radius and molar mass of PAA-TPE0.01 in the presence of Ca2+, Mg2+, or Na+ at various concentrations and elucidate the origin of the Ca2+ selectivity. In contrast to Na+, which exclusively triggered nonfluorescent interpolymer aggregation of PAA-TPE0.01, Ca2+ and Mg2+ induced polymer-chain folding associated with AIE from the TPE pendants. Importantly, Ca2+ caused polymer-chain folding more effectively than Mg2+. Consequently, polymer aggregates formed in the presence of Ca2+ possessed a much higher inner density than those formed in the presence of Mg2+, leading to a more pronounced AIE behavior and, in turn, the Ca2+ ion selectivity over Mg2+.

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