STRUCTURAL CHARACTERIZATION OF INTERCALATED C2FX COMPOUNDS USING XAFSPOLARIZATION DEPENDENCIES

Orientation dependencies of FeK, BrK EXAFS and XANES spectra have been measured for intercalated compounds of the composition C2Fx yA (X ap proximate to 1, A= Br-2, BrF3, FeBr3, Fe(AA)(3), FeCl3) synthesized by diffusion from solutions. An approach has been developed which allows determination of the ranges of the orientation angles of T-shaped BrF 3 molecules from XANES spectra. The values of the orientation angles o f BrF3 molecules were determined by simultaneously analyzing EXAFS and XANES data. It was found that heating leads to the formation in tile intercalated compound of lens-like regions containing oriented BrF3 mo lecules. The orientation and geometry of Br-2 molecules in the studied compounds were shown to be substantially different from those in grap hite intercalation compounds. The intercalation was shown to lead to d eformation of the Fe(AA)(3) molecule while the FeCl3 molecules form di mers.