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Three new polyoxometalates K_2[H_2(As_3O_3)_2(Mo_6O_(18))(NiO_6)]×H_2O(1), K_2[H_2-(As_3O_3)_2(Mo_6O_(18))(Co O6)]×H_2O(2) and [Zn(H4,4?-bpy)2(H_2O)4][(As3O3)2(Mo_6O_(18))(ZnO_6)]×4H2O(3)(4,4?-bpy = 4,4?-bipyridine) have been synthesized un