期刊
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
卷 119, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/qua.25867
关键词
carbene triel bond; imidazole; silylene; substituent effects
类别
资金
- Open Subject of Faculty of Chemistry of QingDao University of Science and Technology [QUSTHX201807]
- QingDao University of Science and Technology [QUSTHX201807]
- National Natural Science Foundation of China [21573188]
The carbene triel bond is predicted and characterized by theoretical calculations. The C lone pair of N-heterocyclic carbenes (NHCs) is allowed to interact with the central triel atom of TrR3 (Tr = B and Al; R = H, F, Cl, and Br). The ensuing bond is very strong, with an interaction energy of nearly 90 kcal/mol. Replacement of the C lone pair by that of either N or Si weakens the binding. The bond is strengthened by electron-withdrawing substituents on the triel atom, and the reverse occurs with substitution on the NHC. However, these effects do not strictly follow the typical pattern of F > Cl > Br. The TrR3 molecule suffers a good deal of geometric deformation, requiring on the order of 30 kcal/mol, in forming the complex. The R(C center dot center dot center dot Tr) bond is quite short, for example, 1.6 angstrom for Tr = B, and shows other indications of at least a partially covalent bond, such as a high electron density at the bond critical point and a good deal of intermolecular charge transfer.
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