Laterally Distorted 1,2-Dibora-4-gallatacyclopentane Anion
A Wahid Mesbah1, Meisam Soleimani1, Fatemeh Akbari Lasboo1
1Chemistry & Chemical Engineering Research Center of Iran, 14968-13151 Tehran, Iran.
Inorganic Chemistry
|December 18, 2025
Summary
Researchers synthesized a novel 1,2-dibora-4-gallatacyclopentane anion. This unique boron-gallium compound exhibits a distorted, nonplanar ring structure due to electronic interactions.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Materials Science
Background:
- Cyclopentane derivatives are fundamental in organic chemistry.
- Boron and gallium compounds offer unique electronic and structural properties.
- Understanding heterocycles containing main group elements is crucial for novel material development.
Purpose of the Study:
- To synthesize and characterize a novel five-membered ring containing boron and gallium.
- To investigate the structural and electronic properties of the 1,2-dibora-4-gallatacyclopentane anion.
- To explore the influence of heteroatoms on ring geometry compared to carbon-based analogues.
Main Methods:
- Synthesis via reaction of dilithium salt of 2,3-diboratabutadiene with Ga2I3.
- Characterization using multinuclear NMR spectroscopy (11B, 1H, 13C).
- Structural analysis via single-crystal X-ray diffraction.
Main Results:
- Successful synthesis of the 1,2-dibora-4-gallatacyclopentane anion.
- Determination of a distorted, nonplanar five-membered ring structure.
- Observed Ga-C-B angles (~95.1°) significantly smaller than cyclopentane (104.4°).
- Torsion angle C-B-B-C (60.3°) is substantially larger than in cyclopentane (14.4°).
- Structural distortion attributed to σ(Ga-C) bond and boron p-orbital interactions.
Conclusions:
- The synthesized 1,2-dibora-4-gallatacyclopentane anion represents a novel heterocyclic compound.
- Electronic interactions between gallium-carbon bonds and boron atoms dictate the nonplanar ring geometry.
- This study expands the understanding of main group element-containing heterocycles and their unique structural features.
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