caa a22 4500 47708558X CHVBK 20180405111503.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF01165803 doi (NATIONALLICENCE)springer-10.1007/BF01165803 Redox behavior of europium in the preyssler heteropolyanion [EuP5W30O11012- [Elektronische Daten] [Mark Antonio, L. Soderholm] In aqueous, mineral-acid electrolytes, the cyclic voltammetry of the europium-exchanged Preyssler heteropolyanion, [Eu111P5W30O110]12- , is unique among all the other trivalent-lanthanide-exchanged anions. [Ln111P5W30Oll0 12-] for Ln≡Ce-Lu. To obtain insights about this issue, we conductedin situ Eu L3-edge XANES IX-ray absorption near edge structure) spectroelectrochemical experiments on an aqueous solution of[EuP5W30O110]12- (5.5 mM) in a sup-porting electrolyte of I M H2SO4 at two extreme potentials. The results demonstrate that the Eu111 ion in the colorless Preyssler anion solution at open circuit potential (+0.21 V vs. Ag/AgCI) is electroactive and is reduced to Eu11 in the resulting heteropoly blue solution through constant-potential bulk elec-trolysis at -0.55 V vs. Ag/AgCI. The reduction is reversible upon complete reoxidation of the reduced anion, the Eu XANES is indistinguishable from that observed at the open circuit potential before electrolysis. This unusual redox behavior of[EuP5W30Oll0]12- may be of technological importance in the area of oxidation catalysis. Plenum publishing Corporation, 1996 Antonio Mark Chemistry Division, Argonne National Laboratory, IL 60439-4831, Argonne aut Soderholm L. Chemistry Division, Argonne National Laboratory, IL 60439-4831, Argonne aut Journal of Cluster Science Kluwer Academic Publishers-Plenum Publishers 7/4(1996-12-01), 585-591 1040-7278 7:4<585 1996 7 10876 https://doi.org/10.1007/BF01165803 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01165803 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Antonio Mark Chemistry Division, Argonne National Laboratory, IL 60439-4831, Argonne aut NATIONALLICENCE 700 1- Soderholm L. Chemistry Division, Argonne National Laboratory, IL 60439-4831, Argonne aut NATIONALLICENCE 773 0- Journal of Cluster Science Kluwer Academic Publishers-Plenum Publishers 7/4(1996-12-01), 585-591 1040-7278 7:4<585 1996 7 10876 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer