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A novel non-covalent hybrid complex formed between silicotungstic acid(H4SiW12O40,SiW12,an abbreviation also for [SiW12O40]4-)and γ-cyclodextrin(γ-CD)was synthesized and characterized by electrospray ionization tandem mass spectrometry(ESI-MS/MS)and proton nuclear magnetic resonance spectroscopy(1H NMR).