Direct sum of irreducible representation
| A1g |
B1g |
B2g |
B3g |
A1u |
B1u |
B2u |
B3u |
| 7 |
5 |
0 |
0 |
0 |
0 |
5 |
7 |
Properties of derivatives and isotopomers by single substitution, h(D2h)=8
| Atom Set* | Site Symmetry** | h(Site Symmetry) | Identical Atoms*** | Element | Chrial | Polar | Isotopomer |
|---|
| Isotope | Mass | Abundance**** |
|---|
| 1 | C2v |
4 | 2 | C | no | yes | 13C | 179.0816 | 1.9024 |
| 2 | C2v |
4 | 2 | H | no | yes | 2H | 179.0845 | 0.026687 |
| 3 | Cs |
2 | 4 | C | no | yes | 13C | 179.0816 | 3.8048 |
| 4 | Cs |
2 | 4 | C | no | yes | 13C | 179.0816 | 3.8048 |
| 5 | Cs |
2 | 4 | C | no | yes | 13C | 179.0816 | 3.8048 |
| 6 | Cs |
2 | 4 | H | no | yes | 2H | 179.0845 | 0.053373 |
| 7 | Cs |
2 | 4 | H | no | yes | 2H | 179.0845 | 0.053373 |
| Total Number of Atoms: | 24 | ✅ Correct Number of Atoms found |
|---|
*Atom Orbit
**Subgroup of point group D
2h
***Calculated as h( D
2h)/h(Site Symmetry)
****Natural Abundance of single substituted Isotopomer in %
Numbers of isomers by substitution
| Replacement | Pattern | Achiral
Isomers | Chiral
Isomer Pairs |
|---|
| Single | X | 7 | 0 |
| Double | X2 | 79 | 0 |
| Double | XY | 141 | 0 |
| Triple | X3 | 517 | 0 |
| Triple | X2Y | 1.531 | 0 |
| Triple | XYZ | 3.042 | 0 |
| Quadruple | X4 | 2.716 | 0 |
| Quadruple | X3Y | 10.657 | 0 |
| Quadruple | X2Y2 | 16.059 | 0 |
| Quadruple | X2YZ | 31.911 | 0 |
| Quadruple | WXYZ | 63.762 | 0 |
| Quintuple | X5 | 10.681 | 0 |
| Quintuple | VWXYZ | 1.275.120 | 0 |
| Sextuple | X6 | 33.859 | 0 |
| Sextuple | UVWXYZ | 24.227.280 | 0 |
Further Reading
- P.W. Fowler, J. Chem. Soc. Faraday Trans. 91(15) 2241 (1995)
Isomer Counting using Point Group Symmetry
Representation Γ3N