@article{oai:nagasaki-u.repo.nii.ac.jp:00027051,
 author = {Sagara, Takamasa and Hagi, Youichi and Toyohara, Masaki},
 issue = {3},
 journal = {Langmuir},
 month = {Jan},
 note = {Although much has become well-known about the structures and properties of redox-active self-assembled mon-olayers (SAMs) on electrode surfaces, their uses as electro-active platforms are still under development. Interaction of the SAM with foreign molecules such as amphiphiles in the solution phase brings about new functionalities. We focused on the enhancement of the redox-dependent binding of anionic surfactants to the cationic redox-active site attached to an alkyl-thiol molecule that forms a SAM on a poly-crystalline Au electrode. There are two main points. One is that we embedded a viologen site in the midway of the alkyl chain to facilitate ion-pairing in the micro-environment of a low dielectric constant. The other is the use of alkyl chain-chain interaction as an important mode of attraction between the surfactants and SAM. We found in the SAM with viologen sites located midway that the binding of anionic surfactants and inorganic anions causes a negative shift of the formal potential of the redox couple of viologen radical cation/viologen dication in line with the binding equilib-rium. In contrast, the anion binding is weak and trivial when viologens are located at the SAM surface. For the SAM with viologens located midway, the surfactant chain-length dependent shift of the formal potential was clearly observed; it fol-lowed the Traube rule but with a smaller slope than that in the original rule. The strong binding enabled us to discuss the blocking and electron transfer mediation abilities of the Au/viologen-SAM/dodecyl sulfate adlayer., Langmuir, 38(3), pp.979–986; 2022},
 pages = {979--986},
 title = {Binding of Sulfate-Terminated Surfactants with Different Alkyl Chain Lengths to Viologen Sites Covalently Embedded in the Interior of a Self-Assembled Monolayer on a Au Electrode},
 volume = {38},
 year = {2022}
}