Comparative unit cell parameters of the respective NCs.
| Clusters | Cu4@oCBT | Cu4@mCBT | Cu4@ICBT |
| Crystal system | Trigonal | Monoclinic | Tetragonal |
| Volume (Å3) | 3333.4 | 4400.1 | 6438.0 |
| Space group | P3121 | P21/c | P43212 |
| Density (mg m−3) | 1.428 | 1.442 | 1.375 |
| Z | 3 | 4 | 4 |
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