| NHC | N-heterocyclic carbene |
| IR | R-substituted imidazol-2-ylidene |
| Me | methyl group |
| Et | ethyl group |
| Pr | isopropyl group |
| Bu | tert-butyl group |
| Ph | phenyl group |
| Tol | 4-methylphenyl (toluene) group |
| Xyl | 2,6-dimethylphenyl (xylene) group |
| Mes | mesityl group |
| Dipp | 2,6-diisopropylphenyl group |
| Ad | adamantyl group |
| ESP | electrostatic potential |
| QTAIM | quantum theory of atoms in molecules |
| NCI | non-covalent interaction (index/method) |
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