Equilibrated tungsten-based polyoxometalate-catalyst systems

摘要

A homogeneous, aqueous solution is disclosed. The solution comprises one or more catalytically or otherwise useful tungsten-based isopoly- or heteropolyoxometalate (POM) complexes present in thermal equilibrium with all chemical species related to the useful complex or complexes by reactions between chemical components of the system, wherein the solution comprises one or more useful polyoxometalates of the general formula [VkNbmTanMooWp(TM)q(MG)rOs]?z- where TM is a d-electron-containing transition-metal ion and MG is a main-group ion; k is 0-18, m is 0-10, n is 0-10, o is 0-19, p is 1-150, q is 0-9 and r is 0-9; kp, mp, np and op provided that p/=1 and k+m+n+o+p/=4; and s is sufficiently large that z0, and wherein the useful POM of the general formula is present at an effective concentration for its intended purpose and all species present within the equilibrated aqueous solution remain dissolved.