Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Information
Name: N,N'-Diphenylbenzidine
Alias: N,N'-Diphenyl-4,4'-benzidine, 4,4'-Bis(phenylamino)biphenyl
CAS No.: 531-91-9
Molecular Formula: C24H20N2
Molecular Weight: 336.43
2. Physical and Chemical Properties
Physical Properties
- Appearance: White to pale off-white crystalline powder
- Odor: Faint aromatic amine odor
- Solubility: Insoluble in water; soluble in toluene, xylene, chloroform, dichloromethane, hot ethanol; slightly soluble in methanol, acetone
- Melting Point: 242–245 °C
- Hygroscopicity: Non-hygroscopic under normal ambient humidity
- Electrochemical characteristic: Easy to form stable free radical cations, good hole transport performance
Chemical Properties
- Molecular structure: Biphenyl parent structure, each terminal benzene ring connected with one phenylamino group, two secondary aromatic amine groups
- Oxidation characteristic: Easily oxidized by air, oxidants to form blue/purple radical cation; sensitive to light and oxygen
- Aromatic amine reactivity: Amino nitrogen can undergo alkylation, acylation, diazotization coupling reactions
- Thermal stability: Stable below 200 °C; above melting point partial decomposition, produce aromatic amine volatile impurities
- Photostability: Sensitive to UV irradiation; long-term illumination turns gray and generates oxidation impurities
- Compatibility: Compatible with non-polar & weak polar organic solvents; incompatible with strong oxidants, concentrated acid, heavy metal ions
3. Main Application Fields
1. Organic Optoelectronic Material (Core Application)
- Hole transport layer material for OLED, organic solar cells, organic photoconductors
- Charge transport agent for laser printer and copier photoreceptor drums
2. Dye & Pigment Intermediate
Precursor for synthesizing triarylmethane dyes, azo dyes and functional colorants
3. Organic Synthetic Building Block
Raw material for polyimide, aromatic polyamine functional polymer synthesis
4. Laboratory Standard Reagent
Reference substance for electrochemical analysis of aromatic hole-transporting compounds
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 531-91-9 |
| Molecular Formula | C24H20N2 |
| Molecular Weight | 336.43 |
| Appearance | White crystalline powder |
| HPLC Purity | Electronic Grade ≥99.5%; Synthetic Grade ≥98.0% |
| Water Content (KF) | ≤0.10% |
| Residue on Ignition | ≤0.05% |
| Heavy Metals (Pb) | ≤5 ppm |
| Packaging | Nitrogen-filled amber aluminum foil vacuum bag / 25kg PE-lined fiber drum |
| Storage Condition | Hermetic, light-proof cool dry warehouse below 25 °C; isolate air and oxidants |
| Transportation Requirement | Aromatic amine solid, dust-proof light-resistant sealed packaging |
| Shelf Life | 24 months under intact nitrogen-filled light-proof vacuum packaging |
Safety Warning
Toxic aromatic amine compound, suspected carcinogenic risk. Inhalation of dust, skin contact or ingestion may cause systemic damage and long-term health hazards. All operations must be carried out in fully sealed fume hood with gas mask, chemical-resistant protective suit and double-layer gloves. Waste residues, waste liquid and contaminated packaging belong to toxic aromatic amine hazardous waste and must be disposed by professional hazardous waste treatment institutions. Sealed storage to avoid contact with air and light to prevent oxidative deterioration.
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