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Reexamination of the crystal structure of phosgenite, Pb2Cl2(CO3)

  • G. Giuseppetti
  • Carla Tadini
Article

Summary

Phosgenite, Pb2Cl2(CO3), crystallizes tetragonal witha=8.160(4) Å,c=8.883(6) Å; space groupP 4/m bm,Z=4. The refinement of 320 crystallographically independent reflections measured on an automatic four-circle diffractometer resulted inR=0.032 (for structure factors).

The structure contains [Pb, Cl(1)−Cl(2)−Cl(1), Pb]-sheets parallel to (001) which are connected by CO3-groups. The Pb-atoms have nine neighbours: four O and five Cl, forming a strongly deformed “monocapped” square antiprism. The Pb−O bond lengths (average: 2.598 Å) and the Pb−Cl bond lengths (average: 3.160 Å) indicate essentially ionic bonds.

Keywords

Reflection Crystal Structure Geochemistry Bond Length Structure Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Neubestimmung der Kristallstruktur des Phosgenits,Pb2Cl2(CO3)

Zusammenfassung

Phosgenit, Pb2Cl2(CO3), kristallisiert tetragonal mita=8,160(4) Å,c=8,883(6) Å; RaumgruppeP 4/m bm,Z=4. Die Verfeinerung mit 320 kristallographisch unabhängigen Reflexen, die auf einem automatischen Vierkreis-Goniometer gesammelt worden waren, ergab (für Strukturfaktoren)R=0,032.

Die Struktur enthält [Pb, Cl(1)−Cl(2)−Cl(1), Pb]-Schichten parallel (001), die durch CO3-Gruppen verbunden werden. Die Pb-Atome haben neun Nachbarn: vier O und fünf Cl, die ein stark deformiertes tetragonales Antiprisma mit einer Zusatzecke bilden. Die Pb−O Bindungslängen (Durchschnitt: 2,598 Å) und die Pb−Cl Bindungslängen (Durchschnitt: 3,160 Å) weisen auf im wesentlichen ionare Bindungen.

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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • G. Giuseppetti
    • 1
  • Carla Tadini
    • 1
  1. 1.Centro di Cristallografia Strutturale del C. N. R.-Istituto di Meneralogia dell'Università di PaviaPaviaItaly

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