Tetrakis(tetrabutylammonium) tetrakis-[(p-cyanophenyl)trioxoarsonato]-tetratriacontaoxododecamolybdate(4-)

Crystals of the title compound, (C 16 H 36 N) 4 [(p-NC-C 6 H 4 As) 4 Mo 12 O 46 ] or (C 16 H 36 N) 4 [{As(C 7 H 4 N)} 4 Mo 12 O 46 ], were synthesized by the reaction of p-cyanophenylarsonic acid and sodium molybdate at low pH. With nitrile groups pointed in tetrahedral directions, these new organically modified polyoxometalate clusters are potential building blocks in coordination networks.