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Two new quaternary lead oxyhalides, Pb 3 MoO 5 Cl 2  and Pb 3 WO 5 Br 2 , have been prepared. They are isostructural with the mineral pinalite, Pb 3 WO 5 Cl 2 , and its barium analog. The crystal structure of Pb 3 MoO 5 Cl 2  has been refined from powder neutron diffraction data to R p  = 0.0564 and R wp  = 0.0342. All these structures contain significantly stretched MO 5  (M = Mo, W) square pyramids incorporated into the [Pb 2 O 2 ] sheets. Bond valence sums indicate significant overbonding of one of the metal sites, which increases along with structural distortions when passing from Pb 3 MoO 5 Cl 2  to Pb 3 WO 5 Cl 2  and from Pb 3 WO 5 Cl 2  to Ba 3 WO 5 Cl 2 . Possibilities of preparing isostructural and structurally related compounds are discussed.

Synthesis of novel leadmolybdenum and leadtungsten oxyhalides with the pinalite structure, Pb 3 MoO 5 Cl 2 and Pb 3 WO 5 Br 2

Synthesis of novel leadmolybdenum and leadtungsten oxyhalides with the pinalite structure, Pb 3 MoO 5 Cl 2 and Pb 3 WO 5 Br 2