The Synthesis And The Character Of Chairl Polyoxometalate Framework：L-,D-[k（H₂O）]₆[H₂GeMo₂W₁₀O₄₀]₃·45H₂O

Owing to the potential applications in catalysis, biological medicine, chiralpolyoxometalates (POMs) have attracted much attention of chemists. The study ofbuilding inorganic framework by chiral polyoxometalates is very few, although manychiral polyoxometalates have been reported.Two pairs of enantiomerically pure three-dimensional (3D) chiral POMframework materials L-, D-[K(H2O)]6[H2GeMo2W10O40]3·45H2O (1a and1b) basedon inorganic achiral building blocks, have been synthesized in the strong acidenvironment and introduced the second heteroatom of Mo, after that, characterized byX-ray crystallography, elemental analysis, powder X-ray diffraction (PXRD), UV-Visspectroscopy, circular dichroism (CD) spectra. Single-crystal X-ray diffractionanalyses revealed that1a and1b are enantiomers, respectively. In1a and1b,{K(H2O)}nlink terminal oxygen and μ2-bridging oxygen of Keggin-type ployanionmoieties to generate1D helical infinite chiral chains, which are further connected bythe achiral Keggin-type polyoxoanions to form3D chiral self-assembly frameworks.They are obtained by spontaneous resolution upon crystallization in the absence ofany chiral source. Compared with Keggin-type L-,D-[K(H2O)]6[H2GeW12O40]30·35H2O,since the introduction of a second heteroatom of Mo, so thatthe absorption peak the compounds of1a and1b had a shift to the visible region, thechiral compounds is expected to be applied to the visible field of catalysis.