Aggregation and luminescent properties of some oxadiazole derivatives incorporated in poly(methylmethacrylate) Langmuir-Blodgett films

N.I.Voronkina, K.B.Vodolazhskii, A.V.Tolmachev, B.M. Krasovitskii, N.A. Popova, I.V. Lisova*


Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Lenin Ave., 310001 Kharkiv, Ukraine
*Kharkiv State Polytechnical University, 21 Frunze St., 310002, Kharkiv, Ukraine

Received July 20, 1998

Characteristics of fluorescen€e have been studied for three oxadiazole derivatives (OXD) incorporated in Langmuir-Blodgett (LB) films mixed with poly(methylmetacrylate). As the OXD concentration increases, the monolayer structurization process becomes subdivided into two stages. At the first one, limited mixing of components in monolayers occurs while at the second, the dopant is released as a separate phase of the monolayer. In LB films, molecular aggregates have been found which are not observed in other phase OXD states (toluenic solutions, spin-coating and polycrystalline films). Analysis of these data combined with computer-aided simulation of OXD molecules space orientation at the air-water interface allowed to present some versions of their close packings in LB layers.

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