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7-Diethylamino-4-methylcoumarin
1. Basic Information
Name: 7-Diethylamino-4-methylcoumarin
Alias: Coumarin 1, 4-Methyl-7-(N,N-diethylamino)coumarin
CAS No.: 91-44-1
Molecular Formula: C14H19NO2
Molecular Weight: 233.31
Category: Coumarin laser dye, fluorescent whitening agent, optical brightener, UV fluorescent pigment, fluorescence analysis reagent
2. Physical and Chemical Properties
Physical Properties
- Appearance: Pale yellow crystalline powder
- Odor: Slight faint coumarin aromatic odor
- Solubility: Soluble in ethanol, methanol, chloroform, acetone, DMF, toluene; slightly soluble in hot water; insoluble in cold water, aliphatic alkanes
- Melting Point: 68–72 ℃
- Density (predicted): 1.07 g/cm3
- Hygroscopy: Non-hygroscopic under normal air humidity
- Aqueous property: Neutral molecule, stable in neutral water; lactone ring hydrolyzes under strong alkali heating to form coumaric acid salt
Chemical Properties
- Molecular structure: Benzopyran lactone skeleton, 4-methyl substitution, 7-position N,N-diethylamino electron-donating group; strong intramolecular charge transfer, excellent blue fluorescence
- Fluorescence characteristic: Strong blue fluorescence under UV excitation; core laser dye for blue-violet band
- Lactone ring reactivity: Ring-opening hydrolysis under alkaline heating; re-close to coumarin under acidification
- Amino group feature: Tertiary amino group easily protonated under acidic condition, fluorescence intensity changes significantly
- Thermal stability: Stable below 120 ℃; above 160 ℃ slight sublimation, long-time high temperature causes oxidative discoloration
- Photostability: Moderately light-sensitive; long-term strong UV irradiation gradually reduces fluorescence quantum yield
- Compatibility: Compatible with most organic solvents, resin carriers; incompatible with concentrated strong alkali, strong oxidants
3. Main Application Fields
1. Laser Dye Raw Material (Core Application)
Blue band coumarin laser dye, used for dye laser oscillation, tunable laser light source
2. Optical Brightener
Fluorescent whitening agent for plastics, synthetic fibers, coatings, ink to enhance bright blue white effect
3. Fluorescent Marker Reagent
Fluorescence probe for biochemistry, industrial flaw detection, anti-counterfeit printing ink
4. Organic Optoelectronic Material
Fluorescent dopant for organic luminescent devices (OLED)
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 91-44-1 |
| Molecular Formula | C14H19NO2 |
| Appearance | Uniform pale yellow crystal without brown impurities |
| HPLC Purity | Laser Dye Grade ≥99.0%, Industrial Brightener Grade ≥98.0% |
| Melting Point | 68–72 ℃ |
| Water Content (KF) | ≤0.10% |
| Residue on Ignition | ≤0.05% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 10g/100g amber light-proof aluminum foil bag, 25kg PE lined fiber drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 ℃, light shielding, isolate strong alkali and oxidants |
| Transportation Requirement | Slightly light-sensitive fluorescent coumarin crystal, moisture-proof sealed packaging |
| Shelf Life | 24 months under nitrogen vacuum sealed storage |
Safety Warning
Mild irritant coumarin fluorescent powder. Dust irritates eyes and respiratory tract; long-term skin contact may cause slight allergic itching. All operations in ventilated fume hood with dust mask, splash-proof goggles and nitrile gloves. Avoid heating with strong alkali to prevent lactone hydrolysis. Waste liquid recovered by solvent distillation; solid waste classified as general aromatic organic hazardous waste for professional disposal.
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