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Li-Juan Cui¹, Lin-Hong Miao¹, Mesías Orozco-Ic^2,3

¹Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130023, China.

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|November 4, 2024

Summary

This summary is machine-generated.

Researchers discovered planar pentacoordinate halogens (ppX) in Li5X6- clusters. These novel structures challenge traditional bonding, stabilized by electrostatic forces and weak covalent interactions.

Keywords:

Halogen bonding global minima hypercoordination magnetic property

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Area of Science:

Inorganic Chemistry
Computational Chemistry
Quantum Chemistry

Background:

Planar hypercoordinate motifs push the boundaries of chemical bonding theory.
Designing planar hypercoordinate halogens is challenging due to electronegativity and delocalization effects.

Purpose of the Study:

To computationally investigate the possibility of planar hypercoordinate halogens in Li_n X_{n+1}^- clusters.
To explore the structural, electronic, and bonding properties of these novel motifs.

Main Methods:

Extensive computational survey of Li_n X_{n+1}^- (n=4, 5, 6; X=F, Cl, Br, I) clusters.
Analysis of structural stability, symmetry (D5h), and electronic properties.

Main Results:

Identified a global minimum for Li_5 X_6^- (X=F, Cl, Br) featuring a planar pentacoordinate halogen (ppX).
The ppX is centrally located within a Li_5 X_5 crown, stabilized by electrostatic interactions and dative covalent bonding.
Observed localized diatropic ring currents around the halogen and lithium atoms due to weak orbital overlap.

Conclusions:

Demonstrated the existence of planar pentacoordinate halogens in specific lithium-halogen clusters.
These findings expand the understanding of hypercoordination chemistry and halogen bonding.
The unique electronic structure suggests potential for novel chemical reactivity and properties.