Structural Features of Mixed Anions (Мо7 – хWхO24)6– and Their Packing in the [Pd(NH3)4]3(Мо7 – хWxO24)⋅6H2O Crystal Structure

— [Pd(NH 3 ) 4 ] 3 (Мо 7 – х W x O 24 )⋅6H 2 O crystals with different Mo/W ratios have been formed as a result of the crystallization of a mixture of Na 6 W 7 O 24 , Na 6 Мо 7 O 24 , and [Pd(NH 3 ) 4 ](NO 3 ) 2 aqueous solutions. Ten crystals with 0.8 ≤ x ≤ 3.4 have been studied. In the polyanion, Mo and W atoms occupy preferred sites rather than are distributed statistically. The crystallographic characteristics of [Pd(NH 3 ) 4 ] 3 (Мо 3.6 W 3.4 O 24 )⋅6H 2 O are found to be as follows: a = 17.4294(2) Å, b = 28.9215(4) Å, c = 30.4435(4) Å, sp. gr. Ibca , V = 15346.1(3) Å 3 , and Z = 16. The anion packing in the structure has been analyzed. It is shown that anions are arranged into a pseudohexagonal motif. The products of thermal decomposition in H 2 atmosphere have been studied. It is shown that a mixture of solid substitutional solutions based on Pd and Mo(W) lattices is formed at 800°C.