• Product Overview: ODB-2 (CAS 89331-94-2)

    2-Anilino-6-(dibutylamino)-3-methylfluoran (commonly known as ODB-2) is a high-performance fluoran-based leuco dye. It appears as a white to off-white crystalline powder that develops a deep black color upon contact with acidic color developers (e.g., bisphenol A, phenolic resins) . It exhibits excellent stability in air, no sublimation, no spontaneous background fogging, and outstanding solubility in organic solvents . The developed black images demonstrate superior light fastness and moisture resistance, making it the industry standard for thermal paper applications

    Property Typical Value

    Appearance (23°C) White to almost white crystalline powder

    Purity (HPLC) ≥98.0%

    Melting Point 183.0 – 187.0°C

    Molecular Formula C₃₅H₃₆N₂O₃

    Molecular Weight 532.67 – 532.68 g/mol

    Density ~1.2 g/cm³

    Parameter Details

    Solubility Soluble in dimethylformamide (DMF), acetone, ethyl

    acetate, toluene; insoluble in water

    Refractive Index ~1.66

    Color Developed Black (upon contact with acidic developers like bisphenolA)

    MDL Number MFCD00307579

  • Performance Advantages
    High Purity (>98%): Ensures consistent color formation and minimizes background haze].
    Excellent Solubility: Readily soluble in organic solvents (DMF, acetone, ethyl acetate) for easy formulation .
    Stable Leuco Form: Colorless in natural state; no sublimation, no spontaneous fogging, air-stable.
    Deep Black Color: Develops intense black images with excellent lightfastness and moisture resistance .
    Thermochromic Behavior: Reversible color change with temperature, useful for smart materials .
    ODB-2 is a versatile fluoran dye with applications spanning traditional thermal paper to advanced optoelectronic and biomedical research :
    Thermal paper / Facsimile paper
    Point-of-sale (POS) receipts
    Labels & tickets Medical imaging films
    Fluorescent biological probes
    OLEDs & optoelectronic devices
    sensors (pollutant detection)
    Light-driven phase change materials
    Security inks / anti-counterfeiting
    Smart windows / temperature indicators
    Thermal Paper & Printing
    ODB-2 is the dominant color former in high-quality thermal paper used for receipts, labels, tickets, and medical imaging. It reacts instantaneously with acidic developers (e.g., BPA, BPS, phenolic resins) under heat to produce a stable black image with excellent resistance to fading, moisture, and plasticizers
    Biotechnology & Imaging
    Due to its strong fluorescence upon structural activation, ODB-2 serves as a fluorescent dye in cell imaging, biomolecule detection, and drug screening assays. Its sensitivity to environmental changes enables use in diagnostic probes and pollutant detection systems
    Advanced Materials
    In optoelectronics, ODB-2 is investigated for organic light-emitting diodes (OLEDs) and optical sensors, where its electronic structure optimizes photoelectric conversion efficiency . It is also used in thermochromic phase change materials (TC-PCMs) for smart windows and thermal energy storage systems, enabling precise temperature control through reversible color change
    Storage Conditions
    Store in a cool, dry, well-ventilated warehouse, away from direct sunlight and heat sources
    Recommended temperature: <15°C (cool, dark place) ; long-term storage in cool, dry area
    Keep container tightly sealed; protect from moisture and air (air-sensitive, store under inert gas recommended)
    Avoid storage near strong oxidizing agents or strong acids
    Shelf life: Minimum 24 months from manufacture date when stored properly under recommended conditions.

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