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Defective vertices in arachno borane networks.

¹Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA. rbking@sunchem.chem.uga.edu

Inorganic Chemistry

|May 28, 2003

Summary

This study analyzes defective vertices in triangulated boron networks of arachno boranes. Stable arachno boranes exhibit ideal boron networks or isolated defective vertices, enhancing structural integrity.

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Area of Science:

Inorganic Chemistry
Boron Chemistry
Structural Chemistry

Background:

Boron-rich clusters exhibit diverse structures, including deltahedral, nido, and arachno frameworks.
Understanding structural deviations from ideal geometries is crucial for predicting stability.
Previous studies analyzed deltahedral borane anions and nido boranes using vertex defect analysis.

Purpose of the Study:

To extend the vertex defect analysis method to arachno boranes (B(n)H(n+6) and B(n)H(n+5)(-)).
To investigate the relationship between structural defects and stability in arachno boranes (4 ≤ n ≤ 10).

Main Methods:

Describing triangulated boron networks by analyzing local vertex environments.
Quantifying deviations from ideal degree 5 vertices (icosahedra) to identify defective vertices.
Applying this analysis to known structures of neutral and anionic arachno boranes.

Main Results:

Neutral arachno boranes B(4)H(10), B(8)H(14), and n-B(9)H(15) feature triangulated boron networks with no defective vertices, correlating with higher stability.
Other known arachno borane structures contain a limited number of defective vertices.
Defective vertices in less stable arachno boranes are typically isolated to minimize structural strain.

Conclusions:

The vertex defect analysis is applicable to arachno boranes, providing insights into their structural characteristics.
Structural perfection (no defective vertices) is linked to enhanced stability in certain neutral arachno boranes.
Minimizing and isolating defective vertices appears to be a stabilizing feature in other arachno borane structures.

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