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Crystal Structure of a Tetrameta‐Polyphosphate: Pb 2 Cs 3 (P 4 O 12 )(PO 3 ) 3
Author(s) -
AverbuchPouchot M. T.
Publication year - 1985
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19855291019
Subject(s) - triclinic crystal system , crystallography , crystal structure , polyphosphate , chemistry , unit (ring theory) , crystal (programming language) , ring (chemistry) , group (periodic table) , physics , phosphate , mathematics , mathematics education , organic chemistry , computer science , programming language
Chemical preparation and crystal structure of Pb 2 Cs 3 (P 4 O 12 )(PO 3 ) 3 are described. The triclinic unit cell has the following dimensions:space group is P 1 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 (P 4 O 12 ) 4− and a linear infinite chain (PO 3 ) ∞ . The unit cell is crossed by two (PO 3 ) ∞ 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 P 4 O 12 4− ring anions are centrosymmetrical located around (0, 1/2, 0) and (0, 1/2, 1/2) inversion centers, half way between the (PO 3 ) ∞ chains. Sr 2 Cs 3 (P 4 O 12 )(PO 3 ) 3 is isotypic with the title compound.