title: Novel self-assembling system based on resorcinarene and cationic surfactant.
abstract: Mixed association of calix[4]resorcinarene with ethyl sulfonate groups on the lower rim and dimethylaminomethyl groups on the upper rim (CR) and cationic surfactant 4-aza-1-hexadecyl-azoniabicyclo[2.2.2]octane bromide (DABCO-16) is studied by methods of tensiometry, conductometry, potentiometry and NMR spectroscopy at fixed CR concentration and varied surfactant concentration. Beyond ca. 0.4 mM of DABCO-16, mixed aggregates enriched by CR are proved to be formed due to electrostatic forces, while beyond ca. 5 mM, aggregates enriched by surfactant occur due to the hydrophobic effect. Spectrophotometry monitoring of the solubilization of a hydrophobic dye, Orange OT, demonstrated that only the second type of mixed aggregate enriched by DABCO-16 is capable of binding the organic probe, while the mixed system where the surfactant is a minor component shows no binding capacity towards Orange OT. This finding can be used for the design of nanocontainers with controllable binding/release properties.
authors.affiliation: A. E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, 8 Arbuzov Str., Kazan 420088, Russia.
authors.forename: Ruslan R
authors.initials: RR
authors.lastname: Kashapov
authors.forename: Tatiana N
authors.initials: TN
authors.lastname: Pashirova
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Kharlamov
authors.forename: Albina Yu
authors.initials: AY
authors.lastname: Ziganshina
authors.forename: Elena P
authors.initials: EP
authors.lastname: Ziltsova
authors.forename: Svetlana S
authors.initials: SS
authors.lastname: Lukashenko
authors.forename: Lucia Ya
authors.initials: LY
authors.lastname: Zakharova
authors.forename: Wolf D
authors.initials: WD
authors.lastname: Habicher
authors.forename: Shamil K
authors.initials: SK
authors.lastname: Latypov
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Konovalov
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D003217:Conductometry; D009682:Magnetic Resonance Spectroscopy; D010649:Phenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry; D010879:Piperazines / Q000737:chemistry; D011199:Potentiometry; D012995:Solubility; D013451:Sulfonic Acids / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D002412:Cations; D010879:Piperazines; D013451:Sulfonic Acids; D013501:Surface-Active Agents; C466160:resorcinarene; D047250:Calixarenes; D010649:Phenylalanine; C007306:triethylenediamine