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The First Nickelacarborane with closo-nido Structure
Ekaterina P Andreichuk1,2, Sergey A Anufriev1, Kyrill Yu Suponitsky1,3
1A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991 Moscow, Russia.
Molecules (Basel, Switzerland)
|December 23, 2020
Summary
Researchers synthesized the first nickelacarborane with a unique closo-nido structure. This novel compound features a nickel atom bridging two distinct carborane clusters, offering new insights into cluster chemistry.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
- Boron Cluster Chemistry
Background:
- Nickelacarboranes are organometallic compounds containing nickel and carborane ligands.
- The synthesis and structural characterization of novel cluster compounds are crucial for understanding bonding and reactivity.
Purpose of the Study:
- To synthesize and characterize the first nickelacarborane exhibiting a closo-nido structure.
- To elucidate the molecular structure and potential formation mechanism of this unique compound.
Main Methods:
- Isolation of the nickelacarborane complex via reaction of nickel(IV) bis(dicarbollide) with pyridine.
- Determination of the molecular structure using single crystal X-ray diffraction.
Main Results:
- The first nickelacarborane with a closo-nido structure, [10',11'-(Py)2-3,9'-Ni(1,2-C2B9H11)(7',8'-C2B8H8)], was successfully isolated.
- X-ray diffraction revealed a nickel atom as a common vertex for both the closo-NiC2B9 and nido-NC2B8 clusters.
- The nickel atom is situated within the open NiC2B2 pentagonal face of the nido-NC2B8 cluster.
Conclusions:
- The formation of this nickelacarborane likely involves nucleophile-induced vertex removal and subsequent cluster rearrangements.
- This discovery expands the known structural diversity of nickelacarboranes and boron clusters.
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