Abstract
Two enantiomerically pure 3D chiral POM-based compounds 1a and 1b, having formula (H3O+)2[K2(SiW12O40)(H2O)4]·H2O, have been isolated during crystallization. Single-crystal X-ray diffraction analysis revealed that 1a and 1b are enantiomers, crystallizing in chiral space groups P6222 and P6422, respectively. The compounds are optically active, and their UV spectra show Cotton effects in the opposite direction. Compounds 1a and 1b represent the examples of 3D chiral frameworks of POM-based inorganic skeletons, obtained by spontaneous resolution upon crystallization from achiral precursors. The crystal structures represent open frameworks with water molecules in the chiral, nanotubular channels.
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