Unprecedented chi isomers of single-side triol-functionalized Anderson polyoxometalates and their proton-controlled isomer transformation

The mu(2)-O atom in Anderson polyoxometalates was regioselectively activated by the introduction of protons, which, upon functionalization with triol ligands, could afford a series of unique chi isomers of the organically-derived Anderson cluster {[RCC(CH2O)(3)]MMo6O18(OH)(3)}(3-). Herein proton-controlled isomer transformation between the delta and chi isomer was observed by using the fingerprint region in the IR spectra and C-13 NMR spectra.