Abstract
AbstractPowder and crystalline samples of the monomer (Et2NH2)5[α‐PW11TiO40]·2H2O (EtN‐1) and a crystalline sample of the μ‐oxo dimer (Et2NH2)8[(α‐PW11TiO39)2O]·6H2O (EtN‐2) of mono‐titanium(IV)‐containing α‐Keggin polyoxometalates (POMs) were prepared and characterized by elemental analysis, thermogravimetry/differential thermal analysis (TG/DTA), FTIR, single‐crystal X‐ray crystallography, and solid‐state cross‐polarization magic angle spinning (CPMAS) 31P NMR and solution (31P and 183W) NMR spectroscopy. The molecular structure of the dimeric polyoxoanion with a μ‐oxo group in 2 was determined for the first time. The monomer–dimer equilibrium in solution was clarified by pH‐varied 31P NMR spectroscopy.
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