Sr3Cu3(PO4)4, Pb3Cu3(PO4)4, BaCu2(PO4)2·H2O, and Ba2Cu(PO4)2·H2O: Crystal Structures and Topological Relationships

✍ Scribed by H Effenberger

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 432 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7953

✦ Synopsis

The four Cu(II)-phosphates(V) Sr 3 Cu 3 (PO 4 ) 4 , Pb 3 Cu 3 (PO 4 ) 4 , BaCu 2 (PO 4 ) 2 • H 2 O, and Ba 2 Cu(PO 4 ) 2 • H 2 O were synthesized under hydrothermal conditions. Their structures were determined from single-crystal X-ray diffraction data. They are related to a group of compounds formed by Cu(II)-PO 4 /AsO 4 layers linked by Me atoms with large ionic radii like alkali, alkaline earth, Pb(II), or Ag(I), and partly by hydrogen bonds. The layers are formed by Cu 3 O 12 units: one square-planar coordinated Cu atom with 1 symmetry is corner connected to two Cu atoms in a [4 ؉ 1] or [5] coordination. Distinct patterns and links of the Cu 3 O 12 groups by PO 4 tetrahedra were observed, AA and AB stacking variants of the layers occur. Ba 2 Cu(PO 4 ) 2 • H 2 O features isolated CuO 4 squares interconnected by PO 4 tetrahedra to chains which represent a component of the layers found in the other compounds.