Potential-Induced Aggregation of Anionic Porphyrins at Liquid|Liquid Interfaces

フォーマット:

論文

責任表示:

Yamamoto, Sho ; Nagatani, Hirohisa ; Imura, Hisanori ; 永谷, 広久 ; 井村, 久則

言語:

英語

出版情報:

American Chemical Society, 2017-10-03

著者名:

• Yamamoto, Sho
• Nagatani, Hirohisa
• Imura, Hisanori
• 永谷, 広久
• 井村, 久則

掲載情報:

Langmuir

ISSN:

0743-7463      

巻:

33

通号:

39

開始ページ:

10134

終了ページ:

10142

バージョン:

author

概要:

金沢大学理工研究域物質化学系<br />The adsorption and self-aggregation of anionic porphyrins were studied at the polarized water|1,2-dichloroethane (DCE) interface by polarization-modulation total internal reflection fluorescence (PM-TIRF) spectrosc … opy. 5,10,15,20-Tetrakis(4-sulfonatophenyl)porphyrin diacid (H4TPPS2-) and protoporphyrin IX (H2PP2-) exhibited high surface activities at the interface. The selective excitation of interfacial species in PM-TIRF measurements elucidated the potential-induced aggregation mechanism of the porphyrins. The J-aggregates of H4TPPS2- were reversibly formed only at the water|DCE interface by applying appropriate potentials even when the porphyrins exist as monomers in the aqueous and organic solutions. In the H2PP2- system, the slow aggregation process was found in the negative potential region. The spectral characteristics and the signal phase of PM-TIRF indicated that the H2PP2- monomers were adsorbed with relatively standing orientation and that the long axis of the J-aggregates was nearly in plane of the interface. H2PP2- was also investigated at the biomimetic phospholipid-adsorbed water|DCE interface. The competitive adsorption of neutral glycerophospholipids effectively inhibited the potential-dependent adsorption and interfacial aggregation processes of H2PP2-. The results demonstrated that the aggregation state of the charged species can reversibly be controlled at liquid|liquid interfaces as a function of externally applied potential. © 2017 American Chemical Society.<br />Embargo Period 12 months 続きを見る

URL:

http://hdl.handle.net/2297/00049543