Restraining symmetry in the formation of small polyoxomolybdates: building blocks of unprecedented topology resulting from "shrink-wrapping" [H2Mo16O52]10--type clusters.

Abstract

A mixed-valence polyoxomolybdate cluster [H2MoVI12MoV4O52]10− was isolated by a new “shrink-wrapping” approach to trap clusters that display low symmetry and nonspherical topology (see scheme; HMTAH=protonated hexamethylenetetraamine). The unprecedented cluster topology results from the restriction of the reorganization of the cluster framework to more symmetrical clusters, yet it reacts with electrophiles, such as FeII.