Strong cr-hole triel-bond between C₅H₅Tr (Tr--B, Al, Ga) and N-base (N-base--NCH, NH₃, NC^-): Cooperativity and solvation effects

The cr-hole triel-bonded and cation-pi interactions are constructed in binary C5H5Tr center dot center dot center dot N-base and ternary Li+center dot center dot center dot C5H5Tr center dot center dot center dot N-base complexes (Tr--B, Al, Ga and N-base--NCH, NH3, NC-). A positive region of electrostatic potential appears near the triel (Tr--B, Al, Ga) atom in the plane of the aromatic ring after replacing the CH group of benzene by a triel atom. Using MP2/aug-cc-pVTZ method, the solvation effect and cooperativity effect were investigated by MEP, ELF, AIM and SAPT analysis. The results indicate that the cooperative effects between cr-hole triel-bonded and cation-pi interactions in Li+center dot center dot center dot C5H5Tr center dot center dot center dot N-base complexes are positive and will be weakened in water environment.