INVESTIGADORES
ROJAS DELGADO Ricardo
artículos
Título:
Intercalation of vanadates in layered Ni(II)-Zn(II) hydroxiacetates
Autor/es:
RICARDO ROJAS; CRISTOBALINA BARRIGA; M. ÁNGELES ULIBARRI; VICENTE RIVES
Revista:
JOURNAL OF SOLID STATE CHEMISTRY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2004 vol. 177 p. 3392 - 3401
ISSN:
0022-4596
Resumen:
Interlayer acetate anions in layered double hydroxyacetates of Ni2+ and Zn2+ have been exchanged by oxovanadates following three synthetic routes (at 60ºC, under hydrothermal conditions and after preswelling with caprylate anions) and different pH; direct exchange at room temperature was not successful. Complete exchange was achieved under adequated conditions, and the precise nature of the interlayer anion depends on the pH during exchange: at low pH (4.5), the presence of alfa-VO3 chains, with anchoring (grafting) of the species to the hydroxide layers, is proposed. At higher pH (9.5) V2O7 4 species are present in the interlayer. Thermal decomposition of these vanadate-intercalated products leads to formation of orthorhombic Ni2+ and Zn2+ vanadates, together with NiO.2+ and Zn2+ have been exchanged by oxovanadates following three synthetic routes (at 60ºC, under hydrothermal conditions and after preswelling with caprylate anions) and different pH; direct exchange at room temperature was not successful. Complete exchange was achieved under adequated conditions, and the precise nature of the interlayer anion depends on the pH during exchange: at low pH (4.5), the presence of alfa-VO3 chains, with anchoring (grafting) of the species to the hydroxide layers, is proposed. At higher pH (9.5) V2O7 4 species are present in the interlayer. Thermal decomposition of these vanadate-intercalated products leads to formation of orthorhombic Ni2+ and Zn2+ vanadates, together with NiO.