Table 1.
Crystallographic parameters reported for piperidinium dihydrogenphosphate (C5H10NH2·H2PO4) [5,6]. Comparison of the reduced cell parameters shows that the two structures are the same. Numbers in parentheses represent standard deviations
| Piperidinium dihydrogenphosphate | ||
|---|---|---|
|
| ||
| Lattice I | Lattice II | |
|
| ||
| Literature cells | ||
| Cell | Cell 1 | Cell 2 |
| a(Å) | 6.2397(6) | 8.385(2) |
| b(Å) | 8.4191(7) | 6.227(2) |
| c(Å) | 8.8523(2) | 8.836(4) |
| a(°) | 112.485(4) | 90.0 |
| β(°) | 89.992(4) | 112.43(3) |
| γ(°) | 90.104(7) | 90.0 |
| V(Å3) | 429.68(5) | 426.4 |
| System | Triclinica | Monoclinic |
| Sp. Gr. | P1 | P21 |
| Yr. Pub. | 2001 | 1989 |
| Ref. No. | [5] | [6] |
|
| ||
| Reduced cells | ||
|
| ||
| Cell | R-Cell 1 | R-Cell 2 |
| a(Å) | 6.2397 | 6.227 |
| b(Å) | 8.4191 | 8.385 |
| c(Å) | 8.8523 | 8.836 |
| a(°) | 112.485 | 112.43 |
| β(°) | 89.992 | 90.0 |
| γ(°) | 90.104 | 90.0 |
| V(Å3) | 429.68 | 426.4 |
a
Cell 1 of Lattice I was reported as triclinic. However, the reduced form No. 35 [7] for Cell 1 shows that the lattice is metrically monoclinic.