Ion-specific self-assembly of a lipophilic guanosine derivative in thin surface films

L. Čoga, S. Masiero, I. Drevenšek-Olenik

Langmuir 31 (2015) 4837-4843.


We investigated the effect of various ions on the surface assembly of a guanosine derivative with one hexadecanoyl chain at the air–water interface. The ions were added to the water subphase prior to spreading of the surface film. Like in bulk water, also at the air–water interface, K+ ions exhibit the strongest influence on the assembly features as they induce structural transformation from lamellar to mosaic-like assembly. In contrast, Li+ and Na+ ions only slightly modify the properties of the assembled film with respect to those observed on pure water. The nature of anions plays an important role in the surface self-assembly as well. We found that (Pic–) is 2 orders of magnitude more effective for assembly regulation than Cl–. All surface assemblies observed in our study are very stable and robust, and consequently they remain practically unperturbed after Langmuir–Blodgett transfer onto a solid support.


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