1H,1'H-2,2'-Bibenzimidazole is a compound consisting of two benzimidazole rings joined directly through their respective 2-positions, forming a symmetrical structure with two pairs of nitrogen atoms facing one another. In inorganic and coordination chemistry laboratories, this compound serves as a bidentate chelating ligand capable of binding a wide range of transition metal ions. In addition, the NH groups on both rings make it a strong hydrogen bond donor, so the compound is also widely used as a molecular recognition unit in supramolecular chemistry and self-assembly research.
The property that makes it sought after is its geometric similarity to the classical ligand 2,2'-bipyridine, but with the added hydrogen bond donating and accepting capability that bipyridine does not possess. The combination of conjugated aromatic rings and the free electron pairs on nitrogen produces metal complexes that frequently display interesting luminescence properties. Its framework is also relatively rigid and thermally stable, and it can undergo tautomerisation and deprotonation, giving access to anionic forms with different coordination behaviour. This electronic flexibility is what makes it valuable across several lines of investigation.
In Indonesian laboratories, this building block is typically used at the research scale in university and institutional chemistry groups working on coordination compounds, metal complex synthesis, and supramolecular materials. It is generally handled in small quantities within a fume hood as part of ligand synthesis, complexation studies, and the preparation of structural derivatives, where the symmetrical heterocyclic framework serves as a starting scaffold for further functionalisation.
- Transition metal complex synthesis: the two facing nitrogen pairs act as a bidentate chelating site that binds a wide range of transition metal ions in a stable, well-defined geometry.
- Coordination chemistry studies: its geometric resemblance to 2,2'-bipyridine makes it a useful comparison ligand for examining how electronic differences alter metal binding behaviour.
- Supramolecular chemistry and self-assembly: the NH groups on both benzimidazole rings act as strong hydrogen bond donors, allowing the molecule to function as a molecular recognition unit.
- Luminescent materials research: metal complexes formed with this ligand frequently show interesting luminescence properties arising from its conjugated aromatic ring system.
- Heterocyclic building block chemistry: the rigid, thermally stable symmetrical framework serves as a scaffold for preparing derivatives and exploring tautomeric and deprotonated anionic forms.
| Brand | TCI |
|---|---|
| CAS number | 6965-02-2 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Heterocyclic Building Blocks |
| Pack sizes | available in standard research-scale laboratory pack sizes; please refer to the packaging options listed on this page |
| Physical form | — |
| Storage | — |
- Catalogue code: B6455
- Chemical name: 1H,1'H-2,2'-Bibenzimidazole
Store the container tightly closed in a cool, dry place away from direct sunlight, moisture, and incompatible materials, following the storage conditions stated on the manufacturer's label and safety data sheet. Keep the material in its original supplier container, or transfer it to a clean, well-sealed chemically resistant container that is clearly labelled with the substance name and CAS number. Handle the solid in a fume hood to avoid inhaling dust, and wear a laboratory coat, safety glasses, and suitable gloves. Use clean, dry spatulas when weighing to prevent contamination, close the container promptly after use, and dispose of residues and contaminated materials in accordance with applicable chemical waste procedures.
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