| 摘 要： | Eight new compounds of α- and β- M2H4SiW16Cr2(OH2)2O ] .xH2O types, where M = K, Me4N, Et4N or n-Bu4N, and 0+6=6,were synthesized from trivacant heteropoly tungstate α-and β-SiW9O34]10 precursors, and characterized by elemental analysis, thermal gravimetric analysis, IR, UV-visible spectra, X-ray photoelectron spectroscopy(XPS), polarography, magnetic measurements and X-ray powder diffraction. The IR and UV spectra conJEirm that α-and β-SlW10Cr2(OH2)2O24]6- isomers possess α-and β-Keg-gin structures. The differences between α-and β-isomers in IR, UV spectra and polarography are discussed.
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