title: Ion-specific self-assembly of a lipophilic guanosine derivative in thin surface films.
abstract: 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.
authors.affiliation: †Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia.
authors.forename: Lucija
authors.initials: L
authors.lastname: Čoga
authors.affiliation: ‡Dipartimento di Chimica Organica "A. Mangini", Alma Mater Studiorum - Università di Bologna, Via San Giacomo 11, I-40126 Bologna, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Masiero
authors.affiliation: †Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia.|§J. Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: Irena
authors.initials: I
authors.lastname: Drevenšek-Olenik
mesh_terms: D000388:Air / Q000032:analysis; D002414:Cations, Monovalent; D002712:Chlorides / Q000737:chemistry; D006151:Guanosine / Q000031:analogs & derivatives / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008094:Lithium / Q000737:chemistry; D010851:Picrates / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D002414:Cations, Monovalent; D002712:Chlorides; D010851:Picrates; D014867:Water; D006151:Guanosine; D008094:Lithium; D012964:Sodium; D011188:Potassium