An example of a Lewis acid is BH 3, and an example for a Lewis base is NH 3. What happens in a Lewis-acid base reaction? The Lewis base donates an electron pair to form a covalent bond …

2023年8月20日 · 本质来源就是，硼的低电负性导致的相对“抬高”的HOMO简并轨道和LUMO 2pz空轨道之间发生的能量相近的混杂，促使整个 [BH3]分子发生畸变，进而二聚成为稳定的产物。 …

The HOMO/LUMO view of chemical reactivity requires recognizing whether a particular HOMO should be unusually high in energy (basic), or a particular LUMO should be unusually low …

3 Hydrogen atoms in BH3: (Ligand group orbitals) a. Symmetry labels of LGOs:-With the symmetry operations of BH3 above, we can determine how many LGO unmoved by creating …

1994年11月20日 · Owing to the electrophilicity of the dienophile, the HOMO LUMO monotransference from butadiene to acrolein becomes predominant over that from acrolein to …

Variation of the dissociation energy of the NH3:BH3–nFn clusters as a function of the number (n) of fluorine substituents, including and without including the energy term associated with the...

For planar BH3, the LUMO (lowest unoccupied molecular orbital) is a(n) (A) antibonding orbital. (B) bonding orbital (C) non-bonding 1s orbital of hydrogen (D) non-bonding 2p orbital of boron. …

This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbitals (SOMOs) and, more commonly, of an unusually high-energy highest …

5.10 Construct an MO diagram for trigonal-planar BH3 by analogy with the MOs for trigonal-planar NH3 in Figure 5.26. Use this diagram to determine the degeneracy and orbital …

1998年3月9日 · The HOMO(NH3) -LUMO(BF3) coefficient is smaller than that for HOMO(NH3) LUMO(BH3); since the HOMO-LUMO energy gaps are very similar (about 13 eV; see Fig. 5), …