X. Li et al., SYNTHESIS, MECHANISM OF FORMATION AND CHARACTERIZATION OF A NEW CLASSOF OCTANUCLEAR MIXED-METAL CLUSTERS NA2M'2[M3O4(O2CET)8]2 (M'=CR OR V, M=MO OR W), Journal of the Chemical Society. Dalton transactions, (14), 1994, pp. 2099-2107
The reaction of Na[M3O2(O2CEt)9] with Cr(CO)6 or M(CO)6 and CrCl3.6H2O
in propionic anhydride solution at 120-degrees-C has resulted in the
formation of the insoluble octametallic clusters Na2Cr2[M3O4-(O2CEt)8]
2 (M = Mo 1 or W 2). The skeletal conversion of [M3O2(O2CEt)9]- into [
M3O4(O2CEt)8]4- and the mode of formation of compounds 1 and 2 from th
e latter species and Cr3+ and Na+ ions has been established. The vanad
ium analogues (M = Mo 3 or W 4) have been synthesized by the reactions
of M(CO)6(M = Mo or W) with NaVO3.2H2O under similar reaction conditi
ons. Clusters 1-4 have been characterized by X-ray crystallography, IR
spectra and magnetic susceptibility measurements.