[en] Vanadium pentoxide gels have been synthesized from vanadium alkoxides. The nature of the resulting material mainly depends on the hydrolysis ratio h=H₂O/V. All alkoxy ligands are not hydrolyzed when h≤3 leading to oxopolymers in which organic groups remain bonded to vanadium. Such gels exhibit an orange color. They give rise to amorphous xerogels or transparent films when dried under ambient conditions. An hydrous oxide gel is obtained when hydrolysis is performed with a large excess of water (h=100). It has a red color and exhibits the same layered structure as vanadium pentoxide gels made via the polycondensation of vanadic acid in aqueous solutions. The nature of alkoxy groups also plays a role. Their reactivity towards hydrolysis decreases when their steric hindrance increases