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3-(9H-Carbazol-9-yl)-9H-carbazole
1. Basic Information
Name: 3-(9H-Carbazol-9-yl)-9H-carbazole
Alias: 3,9'-Dicarbazole
CAS No.: 18628-07-4
Molecular Formula: C24H16N2
Molecular Weight: 332.40
Category: Bicarbazole aromatic heterocyclic intermediate for organic optoelectronic materials
2. Physical and Chemical Properties
Physical Properties
- Appearance: Off-white to pale light yellow crystalline powder
- Odor: Odorless heterocyclic solid
- Solubility: Soluble in THF, chloroform, toluene, dichlorobenzene; slightly soluble in hot ethanol and methanol; insoluble in water and aliphatic alkanes
- Melting Range: 228–232 °C
- Hygroscopy: Non-hygroscopic under normal ambient humidity
- Aqueous Property: Highly lipophilic neutral nitrogen heterocycle, no solubility in pure water
Chemical Properties
- Molecular Structure: Two carbazole rings linked via N9 of one carbazole and C3 of another carbazole, containing two aromatic N-H-free nitrogen sites
- Aromatic Substitution: The conjugated bicarbazole skeleton supports halogenation, formylation and electrophilic substitution to prepare functional optoelectronic monomers
- Cross-Coupling Reactivity: Unsubstituted aromatic carbon sites can undergo Suzuki, Buchwald-Hartwig coupling for constructing long conjugated hole-transporting materials
- Thermal Stability: High thermal decomposition temperature; stable below 200 °C without decomposition, suitable for OLED vacuum evaporation processing
- Photostability: Moderately sensitive to strong UV irradiation; prolonged exposure generates trace oxidized impurities and darkens powder
- Compatibility: Good miscibility with common aromatic organic solvents and resin monomers; incompatible with strong oxidants, concentrated strong acid and heavy metal catalysts
3. Main Application Fields
1. Organic Optoelectronic Material Intermediate (Core Application)
Key precursor for synthesizing OLED hole transport materials, organic light-emitting layer host materials and organic photoconductors; bicarbazole conjugated structure provides high hole mobility and excellent thermal stability for luminescence devices
2. Organic Semiconductor Research Reagent
Standard conjugated aromatic substrate for laboratory research on organic field-effect transistors and organic photovoltaics
3. HPLC Reference Standard
Reference substance for quality testing of bicarbazole intermediates in optoelectronic chemical production
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 18628-07-4 |
| Molecular Formula | C24H16N2 |
| Appearance | Uniform off-white crystalline powder without visible foreign impurities |
| HPLC Purity | OLED Optoelectronic Grade ≥99.5%; Synthetic Intermediate Grade ≥99.0% |
| Water Content (KF) | ≤0.20% |
| Melting Range | 228–232 °C |
| Residue on Ignition | ≤0.05% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Nitrogen-purged amber vacuum aluminum foil bags / PE-lined fiber drums |
| Storage Condition | Hermetically sealed dark dry warehouse below 25 °C; strictly isolated from light, oxidants and acidic reagents |
| Transportation Requirement | Light-sensitive bicarbazole solid, fully sealed light-proof moisture-proof packaging |
| Shelf Life | 24 months under nitrogen-filled vacuum sealed storage |
Safety Warning
Mild irritant aromatic bicarbazole powder. Dust irritates eyes, respiratory tract and skin; long-term skin contact may induce slight allergic dermatitis for sensitive persons. All operations must be performed inside ventilated chemical fume hoods with dust respirators, chemical-resistant gloves and full-face safety goggles. Airtight dark storage is required to prevent photooxidation discoloration. Waste liquid needs organic solvent recovery and neutralization treatment; solid waste is classified as organic hazardous waste and must be disposed by licensed professional hazardous waste treatment facilities.
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