In attempts to produce Bi2WO(OR)10 [Bi2W] (a possible structure of which is shown above), Bi(OR)3 and WO(OR)4 were mixed in a 2:1 ratio.
For R = C2H4OMe, 1H, 13C, 17O and 183W NMR spectra did not provide unambiguous evidence for [Bi2W]1, and an X-ray crystal structure could not be obtained.
However, 17O NMR hydrolysis studies showed formation of Bi-O-Bi but not W-O-W, suggesting aggregation of [Bi2W]1 units rather than individual Bi1 and W1.