Details

Autor(en) / Beteiligte

• Maruyama, Haruka
• Maeda, Momo
• Fujimori, Atsuhiro

Titel

Interfacial film conformation and its molecular arrangement of s-triazine derivatives containing three fluorocarbons without hydrophilic groups

Ist Teil von

• Journal of fluorine chemistry, 2021-10, Vol.250, p.109880, Article 109880

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A monolayers on the water surface of a non-amphiphiles having no hydrophilic group were formed.•Langmuir monolayers of s-triazine derivatives having three fluorocarbons was prepared.•Fluorinated compounds having no hydrophilic group formed monolayers with minimum contact to water.•Derivative with long chains achieved a two-dimensional crystalline packing.•Contact angle of the monolayer changed to reflect fluorocarbon chain length. A monolayer on the water surface or a Langmuir monolayer of fluorinated long-chain s-triazine derivatives with no hydrophilic groups was formed, and its interfacial conformation was verified. As a highly water-repellent monolayer-forming substance, s-triazine derivatives with fluorocarbon chains of different chain lengths were used. These derivatives were poorly soluble in organic solvents and were spread from a mixed solution of chloroform and trifluoroacetic acid supported by a clean glass rod. Although interaction with the water surface was weak owing to a lack of hydrophilic groups, all the molecules reflected the interfacial film behavior in the surface pressure-area isotherms. These derivatives formed orientation almost perpendicular to the water surface in the normal direction to minimize unstable contact between the water subphase and fluorocarbon in the monolayer on the water surface. Atomic force microscopy revealed that derivatives with long fluorocarbons exhibit a two-dimensional crystal morphology based on van der Waals interactions between fluorocarbons. The multilayers of this derivative were found to form a highly oriented structure by polarized infrared spectroscopy and out-of-plane X-ray diffraction. However, it was predicted that the in-plane molecular packing was not always dense. In addition, the results of the contact angle measurement of the monolayer confirmed a systematic difference based on the change in chain length. [Display omitted]