| | 1 | Author
| Peter Kaiser, Wolfgang Jeitschko | Requires cookie* | | | Title
| Preparation and Crystal Structures of the Ternary Compounds Ag2SiP2 and AuSiP  | | | | Abstract
| The title compounds were prepared by solid state reaction of the elemental components. Their crystal structures were determined from single-crystal X-ray diffractometer data. Ag2SiP2: 142d, a = 652.75(5) pm, c = 855.0(1) pm, Z = 4, R = 0.024 for 611 structure factors and 14 variable parameters; AuSiP: R3m, a = 345.9(1) pm, c = 1720.0(3) pm, Z = 3, R = 0.023 (352 F values, 11 variables). The silicon atoms in Ag2SiP2 are tetrahedrally coordinated by phosphorus atoms. The compound might therefore be considered as a phosphidosilicate and its formula can be rationalized as (Ag+l)2Si+4(P_3)2. However, Ag2SiP2 is not a tetrahedral compound since the phosphorus atoms have five near neighbors (3Ag + 2Si) and the silver atoms are coordinated by three phosphorus atoms in almost trigonal planar coordination. Weak silver-silver bonding is assumed for the shortest Ag-Ag contacts of 318 pm. In AuSiP the gold atoms are in a linear coordination of one silicon (235.5 pm) and one phosphorus atom (232.6 pm). The silicon and phosphorus atoms are tetrahedrally coordinated (3Si + 1 Au and 3P + 1 Au, respectively). Thus, the elements can be assigned oxidation numbers according to the formula Au+lSi+2P-3 . This structure was also refined in the centrosymmetric space group R3m, but in this improper setting the silicon and phosphorus atoms occupy one crystallographic site with random occupancy. | | | |
Reference
| Z. Naturforsch. 52b, 462 (1997); received September 13 1996 | | | |
Published
| 1997 | | | |
Keywords
| Crystal Structure, Two-Electron Bonds, Zintl Compounds | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0462.pdf | | | | Identifier
| ZNB-1997-52b-0462 | | | | Volume
| 52 | |
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