@article{oai:kanazawa-u.repo.nii.ac.jp:00043196,
 author = {永谷, 広久 and 井村, 久則 and Yamamoto, Sho and Nagatani, Hirohisa and Imura, Hisanori},
 issue = {39},
 journal = {Langmuir},
 month = {Oct},
 note = {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) spectroscopy. 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., Embargo Period 12 months, 金沢大学理工研究域物質化学系},
 pages = {10134--10142},
 title = {Potential-Induced Aggregation of Anionic Porphyrins at Liquid|Liquid Interfaces},
 volume = {33},
 year = {2017}
}