Coordination of Pt(IV) by {P 8 W 48 } Macrocyclic Inorganic Cavitand: Structural, Solution, and Electrochemical Studies.

Hydrothermal reaction of a macrocyclic inorganic POM cavitand Li 17 (NH 4 ) 21 H 2 [P 8 W 48 O 184 ] with [Pt(H 2 O) 2 (OH) 4 ] results in coordination of up to six {Pt(H 2 O) x (OH) 4- x } fragments to the internal surface of the polyoxoanion. The product was isolated as K 22 (NH 4 ) 9 H 3 [{Pt(OH) 3 (H 2 O)} 6 P 8 W 48 O 184 ]·79H 2 O ( 1 ) and characterized by multiple techniques in the solid state (SCXRD, XRPD, XPS, FTIR, and TGA) and in solution (NMR, ESI-MS, and HPLC-ICP-AES). Electrochemical properties were studied both in solution and as components of the paste electrode. The complex shows electrocatalytic activity in water oxidation.