A hydrogen-bonded cluster with 'onion-type' structure, encapsulated and induced by a spherical cluster shell: [(H2O)(n) subset of (Mo72Mo60O372)-Mo-VI-O-V(HCO2)(30)(H2O)(72)](42-)
A. Muller et al., A hydrogen-bonded cluster with 'onion-type' structure, encapsulated and induced by a spherical cluster shell: [(H2O)(n) subset of (Mo72Mo60O372)-Mo-VI-O-V(HCO2)(30)(H2O)(72)](42-), CHEM COMMUN, (10), 1999, pp. 927-928
By reacting an aqueous solution of ammonium heptamolybdate with formic acid
in the presence of hydrazinium sulfate at pH approximate to 4.2 the compou
nd (NH4)(42)[(Mo72Mo60V)-Mo-VI-O-372(HCO2)(30)(H2O)(72)]. xHCO(2)Na . yH(2)
O 1 (x approximate to 30, y approximate to 250) with spherically shaped sta
ble cluster anions is obtained; owing to the spherical shape of the cluster
-shell template, the anion 1a (with the small 'nondisturbing' bidentate HCO
2- ligand) exhibits a remarkable overall 'onion-type' structure, thereby re
vealing also a novel type of inclusion: a hydrogen-bonded cluster with 'oni
on-type' structure, which suggests interesting aspects for a new type of su
pramolecular chemistry.