Nitride sulfide chlorides

ThMn,2-type structure) 68 5.3. Quaternary nitride sulfide chlorides 90... 

All the crystal structures of the nitride chlorides have as a common feature that they contain N -centered tetrahedra, the electroneutrality of the compound being assured by the chlorine ligands. This dominating structural feature, underlined recently by Schleid (1996), is common to (oxy)nitride bromides and iodides and also to nitride sulfides and nitride sulfide chlorides. 

The chlorine-poor isotypic series of nitride sulfide chlorides R6N3S4CI (R=La-Nd) were prepared by Lissner et al. (1996) from appropriate molar ratios of metal R, sulfur, NaN3 and RCI3 chloride at 850°C. Their orthorhombic (Pnma) crystal structure, determined from single crystal data of the lanthanum compound, exhibits two different chains of connected [NR4] tetrahedra, which are held together by the X-ray diffraction indistinguishable anions S " and Cl". 

In addition, two new compositions Pr5N3S2Cl2 and R10NS13CI (R=La-Pr), which were only briefly mentioned by Uhrlandt and Meyer (1995) and also recently by Schleid (1996), will be discussed in full detail by Schleid and coworkers. Both contain [R4N] tetrahedra, however, whereas in the first one the [Pr4N] tetrahedra are connected to form chains, isolated tetrahedral units can be found in the second ones. These R10NS13CI nitride sulfide chlorides can be structurally compared to the oxysulfide Pr]oOS]4 (Schleid and Lissner 1991) and to the new quaternary nitride sulfide NaPrioNSi4 (Schleid 1996). 

The unusual features of the new high temperature superconductors have been outlined. It is suggested that further synthetic studies, using some general guidelines coupled with a few physical property measurements, of new oxides as well as nitrides, sulfides, hydrides, and perhaps even chlorides may well lead to more of these fascinating novel superconductors. 

BARIUM DINITRATE (10022-31-8) BaN20j A strong oxidizer accelerates the burning of combustible materials. Incompatible with reducing agents, including hydrides, nitrides, sulfides, phosphorus, stannous chloride combustibles, strong... 

BIS (p-CHLOROPHENYL)-2,2,2-TRICHLOROETHANE or 2,2-BIS (p-CHLOROPHENYL)-l,l-TRICHLORO-ETHANE or 2,2-BIS (p-CHLORO-PHENYL)-l,l,l-TRICHLOROETHANE or ,a-BIS (p-CHLOROPHENYL)-/ ,/ ,/ -TRICHLORETHANE (50-29-3) C14H9CI5 Combustible solid (flash point 324 to 340°F/162 to 171°C). Incompatible with strong oxidizers reducing agents, including metal hydrides, nitrides, sulfides, alkali metals, and metal alkyls ferric chloride aluminum chloride salts of iron or aliuniniun alkalis and alkaline media. May be incompatible with many alkali metals ... 

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