I. Physical and Chemical Properties
3,4-Ethylenedioxythiophene, also known as 3,4-ethylenedioxy thiophene and abbreviated as EDOT, has the chemical formula C₆H₆O₂S and CAS No. 126213-50-1. It is a colorless to pale yellow liquid with a melting point of 10.5 °C. It is slightly soluble in water, with a solubility of 2.1 g/L in water at 20 °C, and has a slightly unpleasant odor.
II. Quality Specifications
| No. | Item | Standard | Unit |
| 1 | Appearance | Colorless to pale yellow liquid | — |
| 2 | Purity (Content) | ≥99.70 | Wt% |
| 3 | Moisture (Water Content) | ≤0.3 | Wt% |
| 4 | Chloride (Cl⁻) | ≤5 | ppm |
| 5 | Specific Gravity (20 °C) | 1.34±0.02 | g/ml |
Remarks
Internal control standard: purity above 99.9%.
III. Applications
As a conductive polymer monomer, EDOT is mainly used for the synthesis of the conductive polymer PEDOT. It is widely applied in modern electronic industries, including:
Solid electrolytic capacitors
OLED displays
Solar cells
Antistatic coatings
Highly conductive coatings
Printed circuit boards (PCBs)
Thick-film electroluminescence
Organic thin-film transistors (OTFT)
IV. Packaging Specifications
1 kg/drum, 5 kg/drum, 25 kg/drum