Novel bolaamphiphilic pyrimidinophane as building block for design of nanosized supramolecular systems with concentration-dependent structural behavior.
A new macrocyclic bolaamphiphile with thiocytosine fragments in the molecule (B1) has been synthesized and advanced as perspective platform for the design of soft supramolecular systems. Strong concentration-dependent structural behavior is observed in the water-DMF (20% vol) solution of B1 as revealed by methods of tensiometry, conductometry, dynamic light scattering, and atomic force microscopy. Two breakpoints are observed in the surface tension isotherms. The first one, around 0.002 M, is identified as a critical micelle concentration (cmc), whereas the second critical concentration of 0.01 M is a turning point between the two models of the association involved. Large aggregates of ca. 200 nm are mostly formed beyond the cmc, whereas small micelle-like aggregates exist above 0.01 M. The growth of aggregates between these critical points occurs, resulting in a gel-like behavior. An unusual decrease in the solution pH with concentration takes place, which is assumed to originate from the steric hindrance around the B1 head groups. Because of controllable structural behavior, B1 is assumed to be a candidate for the development of biomimetic catalysts, nanocontainers, drug and gene carriers, etc.
A. E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, 8, ul.Akad. Arbuzov, Kazan, 420088, Russia.
Mikhail A
MA
Voronin
Dinar R
DR
Gabdrakhmanov
Vyacheslav E
VE
Semenov
Farida G
FG
Valeeva
Anatoly S
AS
Mikhailov
Irek R
IR
Nizameev
Marsil K
MK
Kadirov
Lucia Ya
LY
Zakharova
Vladimir S
VS
Reznik
Alexander I
AI
Konovalov
D003217:Conductometry; D004126:Dimethylformamide; D004553:Electric Conductivity; D005663:Furans / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D008027:Light; D047028:Macrocyclic Compounds / Q000737:chemistry*; D008823:Micelles; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology; D010316:Particle Size; D011728:Pyridones / Q000737:chemistry*; D011744:Pyrimidinones / Q000737:chemistry*; D012542:Scattering, Radiation; D013500:Surface Tension; D014783:Viscosity; D014867:Water
D005663:Furans; D047028:Macrocyclic Compounds; D008823:Micelles; D011728:Pyridones; D011744:Pyrimidinones; C543575:bolaamphiphile; D014867:Water; D004126:Dimethylformamide