A new inorganic-organic hybrid of 2-aminopyridine/ [P2W18O68(HOSnIVOH)3]12− (1) has been synthesized via an aqueous solution reaction of [P2W18O68(HOSnIVOH)3]12− (P2W18Sn3) and 2-aminopyridine. The inorganic-organic hybrid has been character- ized using elemental analysis, FE-SEM, EDX, TG analysis, FT-IR, pow- der X-ray diffraction, and single-crystal X-ray crystallography. The results show that the sandwich structure of P2W18Sn3 polyoxometa- late remains intact in the inorganic-organic hybrid but a structure rearrangement of the nanoparticle composed of the Keggin struc- ture (1a) was observed by calcination at higher than 300 �C. The sin- gle crystal analysis confirms the anchoring of 2-aminopyridine on the P2W18Sn3 polyanion via the formation of a Sn–O–C bond. The catalytic activity of 1 has been evaluated through the oxidation of sulfides to sulfone with H2O2 and that of (1a) in the synthesis of tet- razoles in water and mild reaction conditions.
