Zusammenfassung
Schultenit, PbHAsO4 [a=4,859(1) Å,b=6,756(1) Å,c=5,843(1) Å, β=95,40(1)°] und PbHPO4 [a=4,6838(3) Å,b=6,6451(2) Å,c=5,7817(3) Å, β=97,138(4)°] sind isotyp und kristallisieren monoklin. Für beide Verbindungen war bei einer Temperatur vonT c∼312 K der Übergang von RaumgruppeP c nachP2/c bekannt. Der Strukturtyp von Schultenit ist durch das Vorliegen einer kurzen Wasserstoffbrückenbindung zwischen zwei in RaumgruppeP2/c über ein Symmetriezentrum ineinander überführbarer XO4-Tetraeder charakterisiert. Die O−H...O-Bindungslänge beträgt in beiden Verbindungen übereinstimmend 2,46 Å. Mit Hilfe von Röntgen-Einkristallstrukturuntersuchungen konnte gezeigt werden, daß dieser Übergang vonPc nachP2/c offensichtlich nur auf einer Ordnung des H-Atoms beruht, während alle anderen Atome auch bei Zimmertemperatur innerhalb des Fehlers eine zentrosymmetrische Atomanordnung aufweisen.
Summary
Schultenite PbHAsO4 [a=4.859(1) Å,b=6.756(1) Å,c=5,843(1) Å, β=95.40(1)°] and PbHPO4 [a=4,6838(3) Å,b=6,6451(2) Å,c=5.7817(3) Å β=97.138(4)°] are isotypic and crystallize monoclinic. For both compounds a transition from space groupPc toP2/c has been described atT c∼312 K. The structure type of schultenite is characterized, by a short hydrogen bond between two XO4 tetrahedra which are combined by a center of symmetry in space groupP2/c. The O−H...O bond length is for both these compounds 2.46 Å. Based on X-ray single crystal structure refinements it has been shown, that the transition fromPc toP2/c is obviously caused only by an ordering of the H atom; all the other atoms are also at room temperature centrosymmetrically arranged within limits of error.
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Effenberger, H., Pertlik, F. Schultenit, PbHAsO4, und PbHPO4: Synthesen und Kristallstrukturen nebst einer Diskussion zur Symmetrie. TMPM Tschermaks Petr. Mitt. 35, 157–166 (1986). https://doi.org/10.1007/BF01082083
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DOI: https://doi.org/10.1007/BF01082083