The crystal structure of anthropogenic Pb2(OH)3(NO3), and a review of Pb-(O,OH) clusters and lead nitrates
- Autor(en)
- Uwe Kolitsch, Ekkehart Tillmanns
- Abstrakt
The previously unknown crystal structure of the basic lead nitrate Pb2(OH)3(NO3) has been determined using single-crystal X-ray diffraction data (Mo-Ka radiation, CCD area detector). The compound is orthorhombic, space group Immm, with a = 8.314(2), b = 8.545(2), c = 17.210(3) A° (R1 = 2.78% for 940 'observed' reflections with F0 > 4s(Fo)). The layered structure contains a previously unknown cuboid [Pb8(OH)12]4+ cluster and NO3 groups. The study used crystals formed by anthropogenic processes on a medieval mine dump, probably involving black gunpowder used in the blasting of ore. Pb2(OH)3(NO3) is associated with a second nitrate, Pb13O8(OH)6(NO3)4, which was previously designated as "Pb6O3(OH)4 (NO3)2" or "Pb3(OH)5(NO3)". It is rhombohedral, space group R3 with a = 10.263 (1). c + 25.454(5) A. and a structure solution is in complete agreement with an independent single-crystal study by Li et al. (2001). Probable hydrogen bonds in Pb2(OH)3(NO3) are indicated. Reported data on [Pbx2+(O,OH)y]n+ clusters and lead hydroxide and oxide nitrates are summarized and discussed critically. The probable conditions of formation of the studied samples are evaluated.
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Journal
- Mineralogical Magazine
- Band
- 67
- Seiten
- 79-93
- Anzahl der Seiten
- 15
- ISSN
- 0026-461X
- Publikationsdatum
- 2003
- Peer-reviewed
- Ja
- ÖFOS 2012
- 1051 Geologie, Mineralogie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/8dc330f6-2358-4500-86a6-59a0977266e4