Kurt O. Klepp, G. Gabl,
"Preparation and Crystal Structure of Cs4Nb2S11"
, in Zeitschrift für Naturforschung B: A Journal of Chemical Sciences, 4-1998, ISSN: 0932-0776, K.O. Klepp, G. Gabl: Preparation and Crystal Structure of Cs4Nb2S11, Z. Naturforsch. 53b (1998) 1236 / Keywords: Chalcogenide, Thioniobate, Polysulfide, Niobium, Cesium
Original Titel:
Preparation and Crystal Structure of Cs4Nb2S11
Sprache des Titels:
Englisch
Original Kurzfassung:
The new polychalcogenide Cs4Nb2S11 was prepared from the melt. Cs4Nb2S11 is orthorhombic, oP68, s.g. Pca21 (No.29), Z=4 with a=13.775(9)Ä, b=8.043(9)Ä, c=18.306(5)Ä. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.052 (1104 Fo's, 154 variables). It is characterized by asymmetric discrete binuclear moieties [Nb2S11](4-) which are separated by the alkali cations. Each Nb atom is side-on coordinated by two S2(2-) groups, one bridging and one terminal sulfide ligand. Nb-S bond lenghts are 2.15(1)Ä to 2.22(1)Ä (terminal) and 2.44(1)Ä to 2.51(1)Ä (others). A further longer Nb-S bond (2.86(1)Ä and 2.90(1)Ä, resp.) expands the coordination of the two crystallographically independent transition metal atoms to distorted pentagonal bipyramidal configurations. The Nb-Nb-distance is 3.517(3)Ä. The anionic groups are arranged in hexagonal close packed slabs running parallel to (001). The atomic arrangement corresponds to that of K4Ta2S11.
Sprache der Kurzfassung:
Englisch
Journal:
Zeitschrift für Naturforschung B: A Journal of Chemical Sciences
Erscheinungsmonat:
4
Erscheinungsjahr:
1998
Notiz zum Zitat:
K.O. Klepp, G. Gabl: Preparation and Crystal Structure of Cs4Nb2S11, Z. Naturforsch. 53b (1998) 1236 / Keywords: Chalcogenide, Thioniobate, Polysulfide, Niobium, Cesium