Abstract
The title compound, dilanthanum dihydrogen hexamolybdoplatinate(IV) hexadecahydrate, La2[H2PtMo6O24]·16H2O, was obtained by reacting La(NO3)3·6H2O with a sodium salt solution of [HnPtMo6O24](8−n)− at pH 2.0, and it was found to crystallize in the monoclinic system in space group C2/c, with the polyanion having the least protonated species and a crystallographical inversion center. Two of the O atoms of the central [PtO6] octahedron were found to be protonated. The protonated O atoms were identified by elongation of the Mo—O(H) bonds and the values of the Mo—O(H)—Mo bond angles. Inter-polyanion hydrogen bonds are not formed.
