Egawa Yuya, Hayashida Ryosuke, Anzai Jun-ichi
Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.
Langmuir. 2007 Dec 18;23(26):13146-50. doi: 10.1021/la701957b. Epub 2007 Nov 10.
We fabricated a layer-by-layer (LbL) film composed of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and poly(allylamine) (PAA) and investigated its pH response by UV-visible spectrometry. When the (PAA/TPPS)5PAA film was immersed in a pH 1.5 solution, J-aggregate bands were observed at 484 and 691 nm. Above pH 3.0, the J-aggregates were completely dissociated and an H-aggregate band was observed at 405 nm. The interconversion between the J-aggregates and H-aggregates in the LbL film was repeatable and controllable by changing the pH of the solutions.
我们制备了一种由5,10,15,20-四（4-磺酸钠苯基）卟啉（TPPS）和聚烯丙胺（PAA）组成的逐层（LbL）薄膜，并通过紫外可见光谱研究了其pH响应。当将（PAA/TPPS）5PAA薄膜浸入pH为1.5的溶液中时，在484和691nm处观察到J-聚集体带。在pH 3.0以上，J-聚集体完全解离，在405nm处观察到H-聚集体带。通过改变溶液的pH值，LbL薄膜中J-聚集体和H-聚集体之间的相互转化是可重复且可控的。
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