A general route for the transfer of large, highly-charged polyoxometalates from aqueous to organic phase

Abstract A new mixed solvent procedure which allows the exchange of polyoxometalate (POM) alkali metal cations for tetrabutylammonium (TBA) and protons is presented. This method has been demonstrated for simple Keggin [PW 12 O 40 ] 3− and Dawson [P 2 W 18 O 62 ] 6− POMs as well as the larger phosphotungstates [Na⊂P 5 W 30 O 110 ] 14− and [K 4 ⊂P 8 W 48 O 184 ] 36− for which no TBA salt has been previously reported.