Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.16: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B2
Clustering of adsorbed molecules on amorphous silica surfaces — •Yulia Rozhkova1, Andrey Gurinov1, Anna Orlova2, Vladimir Maslov2, Ilya Shenderovich3, and Valentin Korotkov1 — 1St. Petersburg State University, St. Petersburg, Russia — 2St. Petersburg National Research Institute on Information Technologies, Mechanics, and Optics, St. Petersburg, Russia — 3University Regensburg, Germany
The specific current aim of this work is to inspect study the feasibility of spectral methods to characterize host-guest interactions and the dynamics of complex heterocycles loaded into silica pores of 4 to 20 nm in diameter. Acridine was adsorbed on the silica surface from vacuum and from solution. The strong hydrogen bound with proton shared is likely formed between hydroxyl groups and heteroatoms of acridine molecules in the first case. By comparing the luminescence spectra of acridine solution in the water and acridine adsorbed on silica from vacuum it was concluded that silica surface, dried in high vacuum at 420 K, contained a variety of adsorption centers, including adsorbed water. Adsorption of acridine from solution of dichloromethane results in formation of acridine aggregates on the surface. It can be happened in the case of island-type of adsorption. Acridine in dichloromethane solutions at different concentrations are investigated in detail. Concentration increasing was accompanied by formation of two types of aggregates. So, acridine self-aggregation was observed in solution. It may cause islet adsorption of acridine in the silica surface in the case of adsorption from solution.