Bonding situations in tricoordinated beryllium phenyl complexes

Area of Science:

• Organometallic Chemistry
• Computational Chemistry
• Chemical Physics

Background:

• Tricoordinated beryllium complexes are less understood than their boron counterparts.
• Phenyl ligands in beryllium complexes can exhibit unique bonding characteristics.
• Investigating pi-interactions is crucial for understanding electron delocalization in hypervalent main group compounds.

Purpose of the Study:

• To investigate the bonding in tricoordinated beryllium phenyl complexes.
• To elucidate the role of pi-interactions and electron delocalization.
• To compare beryllium complexes with related triarylboranes.

Main Methods:

• Experimental NMR spectroscopy and single crystal X-ray diffraction.
• Computational methods including topology analysis of electron density.
• Energy decomposition analysis using natural orbital for chemical valence.

Main Results:

• Evidence of pi-interactions and double bond character in Be-element bonds.
• Elliptical electron density distributions at bond critical points.
• High polarization of Be-element bonds, influenced by surrounding ligands.

Conclusions:

• Beryllium phenyl complexes exhibit significant pi-delocalization.
• Ligand environment critically affects the degree of pi-delocalization.
• Findings provide a comparative understanding with triarylboranes.