Synthesis and Solid State Structures of the Hydrogen‐Bonded Hexamolybdoplatinate(IV) Tetramer [(PtMo 6 O 24 ) 4 H 23 ] 9– and the Hexamolybdoplatinate(IV) Trimers [(PtMo 6 O 24 ) 3 H 16 ] 8– and [(PtMo 6 O 24 ) 3 H 14 ] 10–

The [(PtMo 6 O 24 ) 3 H 16 ] 8– , [(PtMo 6 O 24 ) 3 H 14 ] 10– , and [(PtMo 6 O 24 ) 4 H 23 ] 9– anions have been crystallized as tetra‐ n ‐butylammonium and tetra‐ n ‐butylammonium/triethylammonium salts and structurally characterized using single‐crystal X‐ray diffraction techniques. Together with the [(PtMo 6 O 24 ) 2 H 7 ] 9– and [(PtMo 6 O 24 ) 2 H 9 ] 7– anions described by Lee and Sasaki in 1994, these anions form a homologous series of hydrogen‐bonded aggregates where stacks of protonated [α‐PtMo 6 O 24 ] 8– anions are stabilized by hydrogen‐bonding interactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)