Abstract: Cr-Mo miscellaneous polyanion and dimethyl sulfoxide solvent compound with B type Anderson structure were synthesized in aqueous solution. The molecular expression is (NH₄)_３Ｈ_３(CrMo₆O₂₄H₆)₂(C₂H₆SO)₆. The single crystal was analyz ed by X-ray and the results of experiment show that the compound is a triclinic crystal system with P1 space group. The chief crystal cell parameters tested by TG means are a=1.428 9(3) nm, b=1.429 5(3) nm, c =1.626 3(3) nm, α=63.93(3)°, β=90.00(3)°, γ=60.05(3)°, R=0.039 8. The curves show that the compound weight lost underwent three procedures. At last the compound was decomposed at 494.41 ℃.

Key words: Anderson structure, crystal structure, synthesis