**2.5 Crystal data for [(***n***-C4H9)4N]4[α-PW11{Al(OH2)}O39]**

C64H146AlN4O40PW11; M = 3692.17, *cubic*, space group *Im-3m (#229)*, *a* = 17.665(2) Å, *V* = 5512.2(8) Å3, *Z* = 2, *D*c = 2.224 g/cm3, μ(Mo-Kα) = 115.313 cm-1. *R1* = 0.0220 (*I* > 2σ(*I*)) and *wR*2 = 0.0554 (for all data). GOF = 1.093 (22662 total reflections, 652 unique reflections where *I* > 2σ(*I*)). CCDC number 851155.
