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 Info
Name: 4,4'-Bipyridine
Alias: 4,4'-Dipyridyl
CAS No.: 553-26-4
Molecular Formula: C10H8N2
Molecular Weight: 156.18
2. Physical & Chemical Properties
Physical Properties
- Appearance: White crystalline powder, slight peculiar heterocyclic odor
- Solubility: Slightly soluble in cold water, soluble in hot water, methanol, ethanol, acetone, chloroform; insoluble in aliphatic alkanes
- Melting Point: 110–113 ℃
- Boiling Point: 305 ℃
- Density (20℃): 1.106 g/cm3
- Hygroscopy: Slightly hygroscopic under high humidity air
- Crystal form: Orthorhombic crystal, good fluidity after drying
Chemical Properties
- Molecular structure: Two pyridine rings connected at para-position, two nitrogen atoms with lone electron pairs
- Weak alkalinity: Pyridine nitrogen can combine with inorganic acids to form hydrochloride, sulfate salts
- Metal coordination: Classic bidentate bridging ligand, coordinates with transition metals (Co, Ni, Cu, Fe, Ru, Zn) to construct metal organic framework (MOF) and coordination polymers
- Quaternization reaction: Nitrogen undergoes alkylation with halogenated alkanes to produce viologen derivatives (electrochromic materials raw material)
- Redox activity: Reversible electron transfer under electrochemical conditions, widely used in electrochemistry research
- Photostability: Stable under indoor weak light; long-term strong UV irradiation slowly turns yellow
- Thermal stability: Stable below 100℃; sublimates at high temperature without obvious decomposition
- Compatibility: Compatible with most polar organic solvents; incompatible with strong oxidants, concentrated strong acid
3. Main Application Fields
1. Coordination Chemistry & MOF Synthetic Ligand (Core Application)
- Bridging ligand for synthesizing metal coordination polymers, MOF porous materials for gas adsorption, separation and catalysis
- Raw material for preparing metal complex catalysts used in organic coupling reactions
2. Electrochromic Material Intermediate
Synthesize methyl viologen, ethyl viologen and other bipyridinium salts; core raw material for electrochromic display devices, electrochromic glass, electrochromic sensors
3. Organic Electronic & Photochemical Reagent
- Electron transfer mediator for photochemical catalytic reaction systems
- Raw material for organic photoelectric sensor, redox flow battery electrolyte additives
4. Pharmaceutical & Pesticide Intermediates
Synthetic skeleton for anti-tumor, anti-viral drug ligands and crop fungicide intermediates
5. Laboratory Analytical Reagent
Metal ion spectrophotometric color developing reagent, standard ligand for coordination chemistry teaching experiment
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 553-26-4 |
| Molecular Formula | C10H8N2 |
| Molecular Weight | 156.18 |
| Appearance | White crystalline powder |
| HPLC Purity | Industrial Grade ≥99.0%; Lab Synthesis Grade ≥99.5% |
| Melting Range | 110.0–113.0 ℃ |
| Moisture Content (KF) | ≤0.10% |
| Residue on Ignition | ≤0.05% |
| Heavy Metals (Pb) | ≤10 ppm |
| Bulk Package | 25kg PE lined fiber drum / aluminum foil vacuum bag |
| Storage Condition | Hermetic cool dry warehouse ≤25℃; isolate humid air, strong oxidants and acidic raw materials |
| Transportation Rule | Heterocyclic ligand solid, moisture-proof sealed packaging |
| Shelf Life | 24 months under intact sealed packaging |
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