Abstract
AbstractChemical preparation and crystal structure of Pb2Cs3(P4O12)(PO3)3 are described. The triclinic unit cell has the following dimensions: equation image space group is P1 with Z = 2. The crystal structure has been solved by using 3350 unique reflexions with a final R value 0.048,The main outstanding feature of this compound rests on the coexistence in its atomic arrangement of two kinds of phosphate anions with different degrees of condensation: a tetrameric cyclic one (P4O12)4− and a linear infinite chain (PO3)∞. The unit cell is crossed by two (PO3)∞ chains, related by centrosymmetry, running in planes perpendicular to the \documentclass{article}\pagestyle{empty}\begin{document}$ \overrightarrow {\rm c} $\end{document} axis at z ≃ 0.25 and 0.75. The two crystallographic independent P4O124− ring anions are centrosymmetrical located around (0, 1/2, 0) and (0, 1/2, 1/2) inversion centers, half way between the (PO3)∞ chains.Sr2Cs3(P4O12)(PO3)3 is isotypic with the title compound.
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