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: 11-methoxy-7H-benzimidazo[2,1-a]benzo[de]isoquinolin-7-one
Alias: Disperse Fluorescent Yellow II, Disperse Fluorescent Yellow 71
CAS No.: 5504-69-8
EINECS: 611-223-3
Molecular Formula: C19H12N2O2
Molecular Weight: 300.31
2. Physical & Chemical Properties
Physical Properties
- Appearance: Bright yellow crystalline powder with strong yellow fluorescence
- Odor: Odorless
- Solubility: Soluble in DMF, DMAc, chloroform, hot ethanol, acetone; slightly soluble in hot toluene; insoluble in water, aliphatic alkanes
- Melting Point: 285–290 °C (decompose slightly at high temperature)
- Density (25℃): 1.36 g/cm3
- Fluorescence property: Strong yellow-green fluorescence under UV light; absorption peak ~430 nm, emission peak ~520 nm
- Heat resistance: Stable below 260℃, suitable for high-temperature plastic coloring
- Light fastness: Excellent anti-photobleaching performance, high light fastness grade
- Hygroscopy: Non-hygroscopic
- Migration resistance: Low migration in polyester, nylon plastic substrates
Chemical Properties
- Fused polycyclic aromatic conjugated structure: Benzimidazole fused with benzisoquinolinone large π-conjugated system, core fluorescent chromophore
- Methoxy group feature: Electron-donating -OCH3 enhances fluorescence quantum yield and improves solubility in organic solvents
- Lactam carbonyl reactivity: The 7-position ketone group is stable under neutral and weak acid; strong alkaline heating will cause ring-opening hydrolysis
- Thermal stability: Long-term heating above 290℃ leads to polycyclic carbonization and fluorescence attenuation
- Acid-base stability: Stable in weak acid/neutral medium; strong concentrated alkali destroys conjugated ring structure and loses fluorescence
- Photostability: Good anti-UV aging performance; long-term strong ultraviolet irradiation will slowly reduce fluorescence intensity
- Compatibility: Compatible with polyester, polyamide, PMMA, ABS resin and most oily coating solvents; incompatible with strong alkali, strong oxidants, concentrated mineral acids
3. Main Application Fields
1. Disperse fluorescent dye for textile printing & dyeing (Core Application)
Disperse Fluorescent Yellow 71, dedicated fluorescent bright yellow dye for polyester fiber, microfiber, polyester elastic fabric. High fluorescence brightness, uniform coloring, good sublimation resistance, used for fluorescent clothing, safety warning fabrics, sports textiles, printing transfer printing ink.
2. Plastic fluorescent colorant
High-temperature resistant fluorescent pigment for engineering plastics (PET, PBT, PC, ABS, PMMA). Used for fluorescent plastic toys, safety warning plastic parts, luminous electronic housing, transparent luminous plastic ornaments, high temperature injection molding products.
3. Ink & coating fluorescent additive
Fluorescent yellow colorant for solvent-based gravure ink, plastic printing ink, industrial fluorescent marking coating, traffic warning coating; bright luminous effect, excellent weather resistance.
4. Biochemical fluorescent probe raw material
Polycyclic aromatic fluorophore intermediate; modified to prepare cell staining fluorescent probes, used for cell imaging, protein labeling, biological fluorescence analysis research.
5. Anti-tumor drug screening compound
High-affinity aryl hydrocarbon receptor (AhR) agonist; laboratory research compound for triple-negative breast cancer targeted apoptosis induction, new anti-cancer small molecule lead compound.
6. Organic photoelectric material intermediate
Synthetic precursor for organic light-emitting diode (OLED) yellow-green luminescent layer materials, conjugated polymer fluorescent monomer.
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 5504-69-8 |
| Molecular Formula | C19H12N2O2 |
| Molecular Weight | 300.31 |
| Appearance | Bright yellow crystalline powder |
| HPLC Purity | Dye Grade ≥98.0%; Electronic/Lab Grade ≥99.0% |
| Melting Range | 285.0 ~ 290.0 °C |
| Moisture Content (KF) | ≤0.15% |
| Single Unknown Impurity | ≤0.10% |
| Total Related Impurities | ≤0.80% |
| Heat Resistance | ≥260℃ |
| Light Fastness | ≥7 Grade |
| Heavy Metals (Pb) | ≤10 ppm |
| Bulk Package | 25kg PE lined fiber drum, sealed light-proof package |
| Storage Condition | Hermetic light-proof cool dry warehouse ≤25℃; isolate strong alkali, oxidants and long-term sunlight |
| Transportation Rule | Ordinary dyestuff solid, light-proof and moisture-proof packaging |
| Shelf Life | 24 months under intact sealed packaging |
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