Table 2.
Optimized structures of M1–M6 in 2-D and 3-D.
| Compound | 2-D structure | 3-D structure |
|---|---|---|
| M1 |  |
 |
| M2 |  |
 |
| M3 |  |
 |
| M4 |  |
 |
| M5 |  |
 |
| M6 |  |
 |
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