Kurt O. Klepp,
"Na2Hg3S4: a thiomercurate with layered anions"
, in Journal of Alloys and Compounds , 9-1991, ISSN: 0925-8388, K.O. Klepp: Na2Hg3S4: a thiomercurate with layered anions, J. Alloys and Comp., 182 (1992) 281
Original Titel:
Na2Hg3S4: a thiomercurate with layered anions
Sprache des Titels:
Englisch
Original Kurzfassung:
Dark red crystals of Na2Hg3S4 were obtained by reacting a stoichiometric mixture of Na2S and HgS at 870 K. Na2Hg3S4 is orthorhombic, oP36, space group Pbca with a=7.308(5)Ä, b=14.011(8)Ä, c=8.231(3)Ä and Z=4. The crystal structure was determined from four-circle diffractometer data and refined to a conventional R of 0.056 for 718 reflections with Fo(2)>3sigma(Fo(2)) and 43 variables (Rw=0.065).
Na2Hg3S4 crystallizes with a new structure type whose outstanding feature is the formation of strongly corrugated anionic layers, 2-oo-[Hg3S4](2-), running parallel to (010). These layers are based on a network of 16-membered rings formed by alternating mercury and sulphur atoms. Two thirds of the mercury atoms are in a trigonal planar co-ordination by suphur (d(Hg-S)=2.49Ä) while the remaining atoms are linearly coordinated (d(Hg-S)=2.344Ä). The Na(+) ions are coordinated by five sulphur atoms in a distorted square pyramidal configuration.
The structure of Na2Hg3S4 can formally be derived from a distorted close-packed array of chalcogen atoms (stacking sequence, (hc)2; stacking direction, [010]).
Sprache der Kurzfassung:
Englisch
Journal:
Journal of Alloys and Compounds
Erscheinungsmonat:
9
Erscheinungsjahr:
1991
Notiz zum Zitat:
K.O. Klepp: Na2Hg3S4: a thiomercurate with layered anions, J. Alloys and Comp., 182 (1992) 281
Forschungs-