Taking into account the oxidant properties of vanadium (V) compounds, the lamellar matrix VOPO4.2H(2)O is used as an oxidant agent towards aniline, giving as product an. VOPO4-polyaniline intercalation compound of formula VOPO4.(C6H4N)(l.l), which exhibits an interlayer distance of 1.6 nm. The SEM micrographs obtained for the VOPO4-Pani, hybrid matrix shows that the microstructure of VOPO4.2H(2)O is changed after reaction, with a total exfoliation of the oxovanadium matrix, as well as a decrease of the crystallite grain sizes. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.54611613