Crystal Lab › Prototype structures › Orthorhombic
Ag(tcm)(pyz) [AgC₈N₅H₄]
Orthorhombic · space group Pnma (No. 62) · Pearson oP72
Symmetry elements and Wyckoff positions (interactive)
Ag(tcm)(pyz) [AgC₈N₅H₄] in Pnma
SettingUnit cell
- Lattice constants
- a = 13.466 Å, b = 7.445 Å, c = 9.175 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 919.8 ų
- Atoms in the conventional cell
- 72 (Ag 4, C 32, N 20, H 16)
- Formula units Z
- 4
- Pearson symbol
- oP72 — orthorhombic, primitive lattice, 72 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Ag1 | Ag | 4c | 4 | 0.8354 | 0.2500 | 0.5274 |
| C2 | C | 4c | 4 | 0.9411 | 0.2500 | 0.1633 |
| C3 | C | 4c | 4 | 0.0787 | 0.2500 | 0.9962 |
| C4 | C | 4c | 4 | 0.9117 | 0.2500 | 0.9001 |
| C5 | C | 4c | 4 | 0.9766 | 0.2500 | 0.0200 |
| N10 | N | 4c | 4 | 0.9138 | 0.2500 | 0.2804 |
| N11 | N | 4c | 4 | 0.1619 | 0.2500 | 0.9763 |
| N12 | N | 4c | 4 | 0.3609 | 0.2500 | 0.6985 |
| C6 | C | 8d | 8 | 0.6777 | 0.3425 | 0.1443 |
| C7 | C | 8d | 8 | 0.6007 | 0.1569 | 0.9256 |
| H8 | H | 8d | 8 | 0.7100 | 0.0867 | 0.2355 |
| H9 | H | 8d | 8 | 0.5688 | 0.4139 | 0.8341 |
| N13 | N | 8d | 8 | 0.6388 | 0.4362 | 0.0349 |
The multiplicity and the Wyckoff letter say how many copies of the site the group makes in one cell and on which kind of symmetry element the site sits; the 72 atoms drawn above are these sites multiplied by all 8 operations. Press Wyckoff under Colour to see the sites, and tick a symmetry element on the left to see which atoms lie on it.
How to read the label
AB8C4D5_oP72_62_c_4c2d_2d_3cd-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP72, then the space-group number 62, then the Wyckoff letters occupied by each element in turn (Ag: 4c; C: 4c; C: 4c; C: 4c; C: 4c; N: 4c; N: 4c; N: 4c; C: 8d; C: 8d; H: 8d; H: 8d; N: 8d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB8C4D5_oP72_62_c_4c2d_2d_3cd-001 (M. J. Mehl et al., Comput. Mater. Sci. 136, S1 (2017); D. Hicks et al., ibid. 161, S1 (2019) and 199, 110450 (2021); S. Eckert et al., ibid. 240, 112988 (2024)). Symmetry elements, Wyckoff assignment and the diagram are computed on this page from the group operations.
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