Epitactic ion-exchange reactions into vanadyl(IV) arsenate
1991; Elsevier BV; Volume: 91; Issue: 1 Linguagem: Inglês
10.1016/0022-4596(91)90053-k
ISSN1095-726X
AutoresM. Martı́nez-Lara, S. Bruque, Laureano Moreno, Miguel Á. G. Aranda,
Tópico(s)Catalysis and Oxidation Reactions
ResumoThe synthesis, structural characterization, thermal stability, and spectroscopic (IR, UV-vis-diffuse reflectance) properties of three vanadyl arsenates are described. Vanadyl(IV) bis(dihydrogenarsenate), [VO(H2AsO4)2] (I), lithium vanadyl arsenate, [(Li4VO(AsO4)2 · 0.5H2O] (II), and nickel(II) and lithium vanadyl arsenate, [(Li2.4Ni0.8VO(AsO4)2 · 4H2O] (III), have been prepared. (I) Tetragonal (a = 9.128 Å; c = 8.128 Å) is prepared by reduction with isobutanol or ethanol from vanadyl(V) arsenate. (II) Cubic (a = 9.024 Å) is obtained from (I) by lithium ion-exchange, and (III) tetragonal (a = 9.106 Å; c = 8.454 Å) is made from (II) by Ni2+ ion-exchange. These exchange reactions are epitactic and the overall result is a topotactic transformation.
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