Self-Assembled, Iron-Functionalized Polyoxovanadate Alkoxide Clusters

Herein we report the synthesis of
a series of iron-functionalized, mixed-valent, polyoxovanadate alkoxide
clusters, [V5O6(OCH3)12Fe]­X (X = Cl, Br, SO3CF3) comprised of a hexanuclear
Lindqvist (M6O19n–) core. By substituting a VO moiety from the well-defined
hexavanadate clusters [VIVnVV6–nO7(OR)12]4–n (R = Me, Et) with
a metal cation, we have developed a novel template for investigation
of the organometallic properties of these systems. Characterization
of the clusters was performed by 1H NMR, Fourier transform
infrared, and electron absorption spectroscopies and electrospray
ionization mass spectrometry. The IR and UV–vis spectra suggest
substantial electronic delocalization, similar to the previously reported
cluster, V6O7(OCH3)12.