Abstract
Polyaniline doped with palladium (PANI–Pd) demonstrated a particular catalytic activity and selectivity in reaction of the hydrogenation of the triple CC bond. Pd K-edge X-ray absorption near edge structure (XANES) studies were performed for PANI–Pd and several palladium compounds like PdCl 2, (NH 4) 2PdCl 4, Pd(NH 3) 4Cl 2, (NH 4) 2PdCl 6, K 2PdCl 4, [(C 3H 5)PdCl] 2, PdCl 2(CH 3CN) 2 and PdO. The measurements were carried out in transmission mode at the station X1 in HASYLAB. Chemical shifts of Pd K edge for PANI–Pd and other palladium compounds were evaluated. The experimental XANES spectra were compared with the theoretical XANES spectrum calculated for PdCl 2 by applying the FEFF8 program. It was found that the Pd K edge XANES spectrum for PANI–Pd was similar to that for ammonium tetrachloropalladate (NH 4) 2PdCl 4. Our results indicated that in the PANI–Pd catalyst the tetrachloropalladate ion [PdCl 4] −2 is coordinated to the amine part of the polymer chain and is responsible for specific catalytic properties.
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