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 synthesiz ed by hydrothermal methods. The crystal structure has been determined by si ngle-crystal X-ray diffraction and refined to R1 = 0,040, The compound is r hombohedral, space group R (3) over bar, a = 10.283(1)Angstrom, c = 25.471( 4) Angstrom, V = 2331.6(5) Angstrom (3), Z = 3, The principal unit of the s tructure is the [Pb13O8(OH)(6)](4+) cluster built from eight [OPb4] tetrahe dra that share a common Pb corner. The OH- anions are coordinated to two Pb atoms each, forming Pb-2(OH)(3+) groups. The [Pb13O8(OH)(6)](4+) clusters found in the structure have not been previously observed in an inorganic co mpound, The [Pb13O8(OH)(6)](4+) clusters are located at the vertices of a 3 (6) net and are linked by (NO3)(-) triangles. (C) 2001 Academic Press.