Crystal Chemistry of Lead Oxide Hydroxide Nitrates: II. The Crystal Structure of Pb13O8(OH)6(NO3)4

The lead oxide hydroxide nitrate, Pb13O8(OH)6(NO3)4, has been synthesized by hydrothermal methods. The crystal structure has been determined by single-crystal X-ray diffraction and refined to R1=0.040. The compound is rhombohedral, space group R , a=10.283(1) ?, c=25.471(4) ?, V=2331.6(5) ?3, Z=3. The principal unit of the structure is the [Pb13O8(OH)6]4+ cluster built from eight [OPb4] tetrahedra that share a common Pb corner. The OH- anions are coordinated to two Pb atoms each, forming Pb2(OH)3+ groups. The [Pb13O8(OH)6]4+ clusters found in the structure have not been previously observed in an inorganic compound. The [Pb13O8(OH)6]4+ clusters are located at the vertices of a 36 net and are linked by (NO3)- triangles.