Fostering the Basic Instinct of Boron in Boron-Beryllium Interactions

Area of Science:

• Computational chemistry
• Quantum chemistry
• Chemical bonding theory

Background:

• Lewis acid-base interactions are fundamental in chemistry.
• Beryllium compounds are known for their Lewis acidity.
• Boron compounds can act as Lewis bases.

Purpose of the Study:

• To investigate the formation and characteristics of novel boron-beryllium bonds.
• To explore the electronic and energetic properties of L2HB···BeX2 complexes.
• To determine the nature and strength of these B-Be interactions.

Main Methods:

• Density Functional Theory (DFT) calculations using the M06-2X functional.
• High-level basis sets (6-311+G(3df,2pd)//6-31+G(d)) were employed.
• Topological analysis of electron density and Electron Localization Function (ELF) calculations were performed.

Main Results:

• Novel boron-beryllium bonds were successfully characterized in L2HB···BeX2 complexes.
• Binding energies reached up to -283.3 kJ/mol for the (H2O)2HB···BeF2 complex.
• Analysis revealed varying degrees of electron sharing, with electron populations in the B-Be region ranging from 0.20 to 2.05 electrons.

Conclusions:

• The studied B-Be interactions are predominantly characterized as beryllium bonds.
• The σ-donor ability of L ligands and beryllium's acceptor nature stabilize these complexes.
• These findings expand the understanding of unusual chemical bonding involving beryllium and boron.