The synthesis and crystal structure of a zirconocene derivative with α-Keggin mono- aluminum-substituted polyoxotungstate,[α-PW11Al (OH) O39ZrCp2] 26−(Cp= C5H5−)(1), which was obtained by the reaction of α-Keggin mono-aluminum-substituted polyoxotungstate with a biscyclopentadienylzirconium (IV) complex, is described herein. Analytically pure, homogeneous, yellow crystals of the tetra-n-butylammonium salt of ...