Journal Article Mesoscopic Structural Aspects of Ca2+-Triggered Polymer Chain Folding of a Tetraphenylethene-Appended Poly(Acrylic Acid) in Relation to Its Aggregation-Induced Emission Behavior

Morishima, Ken  ,  石割, 文崇  ,  Ishiwari, Fumitaka  ,  松村, 聡子  ,  Matsumura, Satoko  ,  福島, 孝典  ,  Fukushima, Takanori  ,  Shibayama, Mitsuhiro

50 ( No. 15 ) 2017-07
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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