Protonation of the decavanadate(6–) ion: a vanadium-51 nuclear magnetic resonance study

Abstract

The first protonation site of [V₁₀O₂₈]^6– differs both from the second protonation site and from the site of preferential interaction with aqueous manganese(II) ion. It is probably an out-of-plane apex, and not a bridging oxygen as has recently been proposed. The ⁵¹V n.m.r. linewidths are almost independent of direct protonation but depend in-directly on more distant protonation.