Vanadium K-edge XANES

Vanadium K-edge XANES measured in transmission mode at 15 K showed that the attached V complex (2) maintained its square pyramidal conformation with a V=0 bond (Figure 2.2a). Curve-fitting analysis of V K-edge EXAFS Fourier transforms (Figure 2.2b) provided local structure information on the supported V complex (2) with an unsaturated conformation, which differs from that of the V-monomer precursor (1). The EXAFS curve-fitting was performed in the R-space with two shells short V=0 and long V—O bonds. A V=0 bond was observed at 0.157 0.001 nm,... 

In Fig. 18 we. report the vanadium K-edge XANES spectra of a spontaneously dehydrated sol-gel sample 1.6 H O. This sample is formed of oriented sheets separated by about 10 A of water molecules. Each sheet consists of square plane bipyramids with the base on the xy plane and a short double bond of 1.58 A on one... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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